Danny Cohen joined BSK Associates in 2011 after a 26-year long career with Hetherington Engineering, Inc. starting in 1985. He has long been involved in planning, implementing and supervising a broad range of geotechnical projects, including geotechnical investigation programs for development of residential and commercial structures and site improvements, development of hillside sites, and investigations of distressed structures. As Branch Manager for BSK Associates, Mr. Cohen is responsible for the day to day operations of the Fresno office, supervising the environmental, geotechnical and construction services division, including the soils and materials testing laboratories.
His work also includes performance and supervision of geotechnical observation and testing services during conventional grading and backfilling operations for site development, as well as during implementation of repairs to distressed structures, including projects utilizing drilled piers and driven piles, tiebacks, compaction grouting, mechanically stablized earth wall systems, geogrid soil reinforcement, dewatering systems and shoring. Mr. Cohen has also performed studies related to groundwater, landslides, liquefaction, envrionmentally contaminated sites, and design and development of on-site sewage disposal systems. Mr. Cohen has served as an expert witness in regards to numerous geotechnical issues, is a licensed civil engineer in California, Nevada, Arizona, Hawaii, Texas, Oregon and Washington, a licensed Geotechnical Engineer in California and Oregon, a licensed attorney in California, and has served on the Board of Directors of CalGeo since 2006.
Walter Crampton, President and Principal Engineer of TerraCosta Consulting Group, has over 40 years of experience in both geotechnical and coastal engineering. With a bachelors and master degree in civil and geotechnical engineering, respectively, and post-graduate studies in oceanography from Scripps Institution of Oceanography, Mr. Crampton has focused much of his career on the design and construction of earth retention systems, with particular emphasis on their use in the coastal environment. As both the civil and geotechnical engineer-of-record for over 100 coastal and landslide stabilization projects over the last 35 years, Mr. Crampton brings significant practical experience to a variety of available stabilization approaches for both landslides and coastal bluffs. Many of Mr. Crampton’s coastal engineering projects have included not only the preparation of construction documents, but also the permitting through the various resource and regulatory agencies, including the California Coastal Commission, State Lands Commission, and the U.S. Army Corps of Engineers. As part of this permit processing work, Mr. Crampton has also specialized in coastal geomorphology, addressing both the evolution of the shoreline and the episodic rate of coastal erosion, along with the coastal processes that shape the coastline, and an assessment of those projects that may not need shoreline stabilization at this time.
Christopher Diaz, P.E. has over 30 years of experience in civil construction and geotechnical engineering. For the past 15 years, the major focus of his work has been in the design and construction of liquefaction mitigation, as well as in-ground improvement projects, including stone columns, grouting, and deep dynamic compaction. Chris became a principal and company president of Diaz-Yourman & Associates (DYA) in December 2004, after 10 years as a staff engineer through senior engineer.
In addition to his corporate responsibilities, Chris serves on the CalGeo Board of Directors and the Orange County and State boards of ACEC. He is also involved in several professional and engineering organizations, including ASCE, WTS, and is a member of the DFI Ground Improvement Committee. Chris has been instrumental in directing DYA to generously support the student chapter of CalGeo at Cal Poly Pomona.
Tom Farrell is the President and Owner of Farrell Design-Build. Farrell Design-Build was incorporated in 1999 as a new company focused on specialty geotechnical contracting in California. Since then, Tom has grown Farrell beyond Geopier to include multiple design-build ground improvement and pile solutions including Impact pier, Rapid Impact Compaction, Driven Grout Pile, Drill Displacement Columns and Piles, Auger Cast Pile, and Helical Mini-Piles.
Tom holds Civil and Geotechnical professional engineering registrations in California. Tom earned his Bachelor of Science in 1990 from Cal Poly, San Luis Obispo and his Master of Science in Engineering from the University of California, Davis. Tom’s graduate studies focused on liquefaction and soil-structure interaction during earthquake events under the direction of Dr. Bruce Kutter and Dr. I.M. Idriss at UC Davis. Tom worked as a geotechnical consultant in the Sacramento and Bay Area for 10 years before becoming a geotechnical contractor in 1999. Tom has over 20 years of experience in geotechnical, foundation engineering, and ground improvement in California. Tom’s interests include being an owner-builder on two custom homes, fishing, camping, reading historical accounts, and mostly spending time with his wife, 3 daughters and son in El Dorado County.
Mr. Gregory is an experienced geotechnical engineer and project manager who has managed geotechnical projects since 1996. He has technical expertise in the analysis and design of slop stabilization measures including geosynthetic reinforced slopes and embankments. CIDH pile structures, and segmental block and soil nail retaining structures. Mr. Gregory is a registered civil and geotechnical engineer with more than 27 years of professional experience.
David Hamilton, P.E., G.E., is the Founder and President of Hamilton & Associates, a geotechnical engineering firm located in Los Angeles. His firm provides geotechnical and geologic services, soils and materials laboratory testing, construction observation and testing, and limited drilling and sampling services. Hamilton received his B.S. in civil engineering at Loyola Marymount University in 1994 and an M.S. in geotechnical engineering at the University of California, Berkeley in 1995.
He has more than 14 years of experience in public works, commercial, industrial, school, and residential projects, including soft and liquefiable sites, port facilities, and hillside and canyon landfill development. He has taught soil mechanics and solid waste engineering in both undergraduate and graduate engineering programs at Loyola Marymount University and is currently active with the California Board of Professional Engineers. David serves on the Board of Directors for CalGeo.
40+ years of experience, 36 years in business
Registered Soils Engineer #2101
Registered Civil Engineer #29244
Registered Structural Engineer #2532
Registered Geotechnical Engineer #2101
Registered Geologist #6348
Certified Hydrologist #539
Certified Engineering Geologist #2029
Former Cal State University Professor
Former Cogswell College Professor
Former Menlo College Professor
Former Professional Engineering Institute Professor
Call 800-US-Soils or 650-969-1985
Tom Holdrege has completed over 1,000 environmental, hazardous materials, solid waste, geotechnical and geologic site characterizations in California since 1986. His experience in environmental site characterization ranges from initial site assessment to complex fracture flow modeling and soil and groundwater remediation.
Bob’s decision to take geology as an elective science course at Pasadena City College (PCC) was influenced by a neighbor who taught there and returned from weekend field trips to the desert with great stories and photographs. Geology classes at PCC taught by two of the best professors Bob had in college sealed the deal. Bob transferred to UCLA where he completed a BS in Geology in 1979 and MS in Engineering in 1982. Bob worked as a geologist and engineer at Kovacs-Byer until leaving in 1988 to join Dave Grover as the Principal Engineer at Grover-Hollingsworth and Associates.
Bob’s expertise in geotechnical engineering has been applied to complicated hillside projects, landslide restoration and evaluation of damaged properties. Bob reviews all of the geotechnical reports prepared by the staff. Bob also provides expert services for attorneys and insurance companies. When not working, Bob enjoys skiing, fishing, gardening and attending basketball and football games.
John Hoobs has more than 25 years of experience with Geocon in engineering geology and geophysics in Southern California. He specializes in structures, transportation, schools and pipelines for residential and commercial land development projects for both private and public clients. His expertise in managing large-scale development has provided clients timely service on projects that have critical schedules. Hoobs has extensive experience in landslide and fault studies, as well as projects requiring rock blasting and placement.
Construction monitoring, verification and adherence to specifications are an integral part of his experience and expertise. He has also provided consultation and expert-witness services for plaintiff and defendant cases involving disputes on residential and public works projects. He is a registered geologist and a certified engineering geologist in California, and a member of the American Society of Civil Engineers, Association of Engineering Geologists, Geologic Society of America, and the San Diego Association of Geologists. John is a Past President on the Board of Directors for CalGeo.
Amer Hussain, P.E., is the Vice President of Engineering for BSK Associates, a geosciences consulting firm with offices throughout Northern California. The firm provides geotechnical, environmental planning and remediation, water resources, geospatial, construction materials testing and analytical laboratory services. He received his B.S. and M.S. degrees in civil engineering from California State University, Fresno.
Hussain has provided geotechnical and environmental engineering services for 18 years in the Central Valley. His experience includes transportation, schools, bridges, public works facilities and water resources planning for both private and public clients. He returned to CSUF in 2002 as a guest lecturer and taught the Introduction to Soils and Foundations course for five years. Hussain is a member of ASCE, ASFE, ACEC, SWANA and served on the Board of Directors for CalGeo.
Dr. Siamak Jafroudi has more than 36 years of professional experience in geotechnical engineering. His area of specialization is material characterization in relation to slope stability evaluation, liquefaction analysis, pavement design, collapse potential, earth retaining structures and earthquake engineering. Dr. Jafroudi's experience encompasses the design and supervision of a multitude of soil mechanics laboratory tests and drilling programs.
He has served as a Principal Engineer on several key projects for such clients as schools, university and college districts, public agencies, transportation agencies, residential and commercial developers, as well as private-sector clients. Dr. Jafroudi is a Registered Geotechnical Engineer (GE), a Registered Environmental Assessor (REA), and is registered in Civil Engineering (PE), all in the state of California. Additionally, he is an active member of the American Society of Civil Engineers, the Earthquake Engineering Research Institute and is a Past President of the Board of Directors for CalGeo.
Todd Kamisky is a Founder and President of Mid Pacific Engineering, and currently manages the firm's Sacramento operations. Kamisky has been working in the geotechnical engineering field since 1994, and his project experience includes master-planned communities, residential subdivisions, infrastructure improvements, detention basins, bridges, communication towers, schools, and commercial/industrial developments.
Kamisky has also performed site-specific ground response studies for numerous projects in the Sacramento and Stockton areas, as well as slope-stability analysis of bluffs, levees and mining pits in the Sacramento and San Joaquin Valley regions. He is a member of the American Society of Civil Engineers, the Structural Engineers Association of Central California, and currently serves as President on the Board of Directors for CalGeo.
Mr. Kropp has over 30 years of local geotechnical experience and is recognized for his expertise in the identification, characterization and mitigation of landslide hazards. Mr. Kropp currently serves on the board of the Earthquake Engineering Research Institutes Northern California chapter (EERI-NC) and is recognized for his contributions in earthquake hazard research. His project experience includes performing geotechnical investigations for schools, roads, subdivisions, hillside properties, office and commercial buildings, and bridges. Mr. Kropp regularly provides geotechnical peer review services to City and County governments and is knowledgeable about geotechnical conditions, principles and practices throughout much of California.
Lutz "Yogi" Kunze is the semi-retired Executive Vice-President of Earth Systems Southwest (ESSW) and currently serves as an Associate Geotechnical Engineer to provide oversight of the geotechnical engineering staff for ESSW. He is a Registered Civil Engineer in California, Arizona, Nevada and a Registered Geotechnical Engineer in California. He served on the Board of Directors of CalGeo and was its president in 1996-97.
Michael Laney is currently a Senior Geotechnical Engineer and Energy Sector Specialist for Terracon Consultants, Inc. He is a Registered Civil Engineer in California and 24 other states, a Professional Engineer in Alberta, Canada, and a Registered Geotechnical Engineer in California. He has overseen civil and geotechnical engineering projects, and has supervised observation and testing of compacted fill and grading operations.
He has been involved with residential, commercial, industrial, transportation, military and infrastructure projects. Currently he is focused on green projects, such as Transmission line, Substation, Wind and Solar foundations. Mike has helped develop and grade the State Geotechnical Engineer license exam for the California State Board of Professional Engineers, Land Surveyors and Geologists (BPLESG) and is on the BPLESG list of Subject Matter Experts who provide review services for reported enforcement actions regarding geotechnical issues. He has served on the Board of Directors of CalGeo since 2007.
Mr. Lokteff has devoted his 20-year professional career to geotechnical engineering and has been with Blackburn Consulting for 11 of those 20 years. He has performed subsurface investigations and provided geotechnical recommendations for levees, roads, bridges, pipelines, communications towers, schools, commercial buildings, residential subdivisions, and landslides. Mr. Lokteff specialized in pipeline installations, deep and shallow bridge foundations and pavement design.
Bob is currently on the CalGeo Board of Directors.
Since founding the company over 40 years ago, Bob Mahony has structured and guided the growth of Soil Engineering Construction, Inc. (SEC) to a point that it is recognized as one of the pre-eminent geotechnical engineering/construction firms in the state.
Bob specializes in geotechnical construction, primarily focusing on landslide repairs, foundation work, groundwater work, grouting, and general work related to Geotechnical Engineering. He originated and first patented the small diameter pipe method of underpinning foundations. In the early stages of the company's development, Bob initiated the process of installing drilled horizontal drains and anchors utilizing high-pressure water jetting.
Bob has been a member of a panel of experts formed by San Mateo county to advise Caltrans on methods of stabilizing the Devil's Slide area on Highway One.
Mr. Mahony is a Registered Civil Engineer, Geotechnical Engineer, Engineering Geologist, and Geologist in the state of California. He is professionally affiliated with the Amcerican Society of Civil Engineers, as well as, the California Contractor's State License Board.
Stego Industries, maker of Stego Wrap Vapor Barrier, is a leading producer of below-slab moisture vapor protection in North America. We have earned the respect, trust, and recommendation of the design and construction community through our commitment to education and technical support.
Moisture-related flooring failures, indoor air quality issues, and lost energy efficiency cost the construction industry billions of dollars each year. Our product, Stego Wrap Vapor Barrier, is the most commonly specified below-slab vapor barrier in the industry. Along with Stego Wrap, we have a full line of accessories to complete a comprehensive and successful installation.
Mike McCarthy has been working with Stego Industries for 8 years and is located at the Stego Home Office in San Clemente, CA. He is the Senior Residential Manager for Stego Industries, a member of the Construction Specification Institute (CSI), a Certified Construction Product Representative (CCPR) and has a Masters in Business Administration (MBA) from Gonzaga University. Mike has given hundreds of accredited seminars to architects, engineers, and contractors in California and is in his fifth year of membership with CalGeo.
Martin McIlory is the Principal Engineering Geologist and Civil Engineer at Taber Consultants and in charge of the West Sacramento and Fresno office professional services. He received his B.S. in Geology from the University of California at Davis and has been practicing geology for 17 years. At Taber Consultants he has participated in transportation and water related projects including: state highway interchanges and local bridges, earth fill dams, levee design, water tanks, and landslides and storm damage repair.
Martin has served on the CalGeo's board of directors since 2011. He has become involved with professors and students at UC Davis, UC Berkeley and California State University, Sacramento to help initiate CalGeo chapters on these campuses. He is also developing the younger CalGeo membership and younger member chapters starting in Sacramento and branching out to the rest of the state. Martin believes that student outreach and participation in CalGeo will strengthen the engineering community and develop future leaders in the profession.
Ted Miyake has been in consulting for almost 28 years--19 with NMG Geotechnical, 7 with Leighton and Associates and 1 with a mechanical engineer in the Bay Area. Nearly all his geotechnical experience has been in southern California on a broad range of projects including large hillside residential, public works, commercial, industrial, and energy sector facilities. Ted started NMG Geotechnical with two partners and an assistant and has seen it ebb and flow (depending on the economy) to its current size of nearly 50. NMG has been a grateful member of CalGeo almost from its beginning. Ted has a BS in civil engineering and MS in geotechnical engineering from Stanford and is a registered civil engineer in California, Nevada and Arizona. Besides engineering, his passions in life are for his wife, three kids, and faith-based humanitarian relief and sustainable development in places like Central America and Africa.
Mike Moscrop, P.E., G.E., is a Principal Engineer at GMU Geotechnical, Inc., a geotechnical and materials testing consulting firm based in Rancho Santa Margarita, Orange County, California. Mike received his undergraduate degree from the University of Huddersfield, England and obtained his Master of Science in Civil Engineering (Geotechnical) from California State University Long Beach. Mike has a broad range of geotechnical experience from his 25+ years in the business, including a wide variety of large and small office, residential, commercial and retail development, public works and infrastructure projects. Mike has also provided expert witness services on a variety of geotechnical issues.
Mike has been an active support of CalGeo for many years, and was recently elected to be a CalGeo board member.
As President of Stoney-Miller Consultants, Inc., Hannes Richter provides clients with national experience in a broad range of geotechnical engineering applications, including residential, commercial, industrial and government projects. He has practical experience in a number of states that includes project management, laboratory and field investigations, rock and soil slope stability analysis, shoreline processes and protection measures, pavement analysis and design, earth dams, shallow and deep foundations, shoring walls and tieback anchor systems, groundwater development/dewatering, engineering feasibility studies, distress investigations, expert witness testimony, and grading and construction monitoring programs.
Richter is a registered Civil Engineer in Oregon, Arizona, California, Nevada and Colorado and a Geotechnical Engineer in California. He is a member of the American Society of Civil Engineers and serves on the Board of Directors of CalGeo. He has a B.S. for Civil Engineering from California State Polytechnic University, Pomona and an M.S. in Geotechnical Engineering from the University of California, Berkeley.
As Technical Advisor to Gregg Drilling & Testing Inc., Dr. Peter Robertson brings more than 40 years experience as an educator, researcher, consultant and practitioner specializing in the areas of in-situ testing and site investigation, earthquake design of geotechnical structures, and soil liquefaction. Peter is recognized as an expert both nationally and internationally in the areas of in-situ testing and soil liquefaction. He has been a consultant to various industrial clients and insurance companies in North America, Asia and Europe for projects involving liquefaction evaluation for major structures, stability of on-shore and off-shore structures, landslides, stability of natural slopes and tailings dams, and use and interpretation of in-situ tests. He is the co-author of the primary reference book on Cone Penetration Testing (CPT). He has also authored or co-authored over 250 publications as well a popular CPT Guide that is freely available via the Gregg website. With support from Gregg, Peter has also assisted in the development of several inexpensive CPT-based interpretation software programs and has presented a series of free webinars on the CPT in an effort to enhance education and practice. Peter continues to provide some private consulting to a wide range of clients.
Dr. Dave Salter has over 30 years of experience in the design and construction of earth retention systems and specialty foundations in the USA and Europe. Dr. Salter worked with the Keller Group in the UK before moving to the USA and joining Schnabel Foundation Company in 1993. As Project Manager in Washington DC and Area Manager in Los Angeles, Dr. Salter was responsible for the design and construction of a wide variety of earth retention projects. Dr. Salter managed the Los Angeles office of TerraCosta Consulting Group and was the Engineer of Record for multiple projects involving temporary shoring, permanent earth retention, landslide stabilization and specialty foundations. As owner and Principal Engineer of DRS Engineering Inc. Dr. Salter provides earth retention and specialty foundation design services to Contractors, Consultants and Owners. Dr. Salter is a regular speaker at industry seminars and provides expert witness testimony on issues related to earth retention and foundation systems.
Greg Silver joined GMU in 1997 and currently serves as the company's President and Principal Engineer. He is instrumental in furthering the direction and character of the company and oversees the majority of the firm's day-to-day operations. Greg's experience in the industry includes more than 29 years of working with clients throughout Southern California on some of the most challenging geotechnical projects. He has worked successfully for and with industrial, residential and commercial developers, master community planners and governmental agencies. He has extensive experience in landslide evaluation and remediation design, geotechnical instrumentation, residential and commercial development, public works projects, municipality consultation, mechanically stabilized earth walls, and forensic projects. In addition, Silver has served as an expert witness in regards to numerous geotechnical issues and as city geotechnical engineer for numerous cities throughout Southern California.
Mr. Silver has a Bachelor’s degree in geological sciences with an emphasis in Geophysics from the University of California at Santa Barbara and a M.S. in Civil Engineering (emphasis Geotechnical engineering) from California State University at Long Beach. He is a registered civil engineer in California and Nevada as well as a Registered Geotechnical Engineer in California. He served as CalGeo’s president in 2010 and is also member of ASCE. Mr. Silver has published several papers on subjects ranging from MSE wall design and performance to Landslide mitigation.
Noah is the Principal Engineer-in-Charge of our Concord office and laboratory testing facility. Noah is responsible for providing leadership and supervising a staff of highly motivated and technically proficient professional engineers, field technicians, materials and construction inspectors and administrative staff. Noah’s technical experience combined with his creativity allows our clients to be confident they are receiving innovative, yet value engineered solutions to limit or eliminate potential project challenges.
Over the span of his professional career, Noah has authored over 500 geotechnical investigation reports. His technical experience includes but is not limited to soils mechanics, foundation engineering, expansive soils, liquefaction, soil nails, pavement design, slope stability, retaining structures, construction and materials testing, forensic investigations and swimming pool engineering. Noah is fluent in the Spanish language.
Scott Stephens is President of Miller Pacific Engineering Group and is responsible for the overall business management of the firm. He is also the Senior Project Manager and Reviewer for numerous Geotechnical and Geo-Civil projects.
He has prepared numerous geotechnical planning reports and environmental impact studies and serves as a Peer Reviewer for several local governmental agencies.
He has conducted many forensic geotechnical investigations and has provided expert testimony on geotechnical issues including slope instability, retaining wall failure, foundation distress and groundwater seepage.
His projects frequently combine investigation of distressed property and remediation design. Such projects have ranged from compaction grouting to re-support a multi-story building, reconstruction of a tunnel lining collapse, stabilization of a creek channel with a tied back soldier pile retaining wall, and reconstruction of a landslide using subdrains and a reinforced earth buttress.
Scott’s Geo-Civil projects have included full engineering design, bid documents, contract management, and construction inspection for a variety of projects: retaining structures, landslide repairs, remedial drainage, pedestrian bridges, restoration of distressed foundations, and synthetic turf athletic fields.
His technical expertise includes sophisticated computer analyses, many conventional and unique exploration techniques, advanced testing methods including in-situ testing by field vane shear, monitoring with inclinometers and piezometers, field permeability measurement, nuclear density gauge testing and seismic refraction surveys.
As Chief Executive Officer, Robert Tadlock is responsible for overall firm leadership including implementing core values, mission, culture, and vision to staff. Robert contributes more than 27 years of industry specific experience in the geotechnical, construction inspection and materials testing field. His passionate commitment ensures that a high quality service is provided to all clients and that any necessary action is taken to maintain the firm’s high reputation for excellence in engineering and customer service. Robert manages business development related activities including; proposal preparation, contract administration, budget tracking, and assuring customer satisfaction. His responsibilities include participation as Project Principal on selected key assignments.
Larry Taylor is the President of Taylor Group, Inc., a geotechnical, environmental and earth sciences consulting firm based in Oceanside, CA. Larry earned a Bachelor of Science degree from California State University at Long Beach in 1979 while working for Southern California Edison's geotechnical group. He returned to CSULB in 1980 as a lecturer and research associate while taking graduate courses. Beginning in 1983, Larry worked for several earth sciences consulting firms including Dames & Moore, The Earth Technology Corporation (now Earth Tech) and Bing Yen & Associates before founding TGI in 1999.
As a CalGeo board member, Larry believes his 30 years of experience as a geotechnical engineer, project manager and executive in the geotechnical profession provides him with a good understanding of important issues affecting our members.
In 2012, Dr. Upp transferred leadership of UPP Geotechnology, Inc., the company he founded in 1983 and headed for almost 30 years, so he could focus his professional practice on litigation support (expert witness) and independent geotechnical consultation. His former company, an efficient seven-person firm, was focused on hillside residential projects in the San Francisco Bay Area, including new construction and properties distressed by earth movement.
Dr. Upp holds a B.A. degree in geology, B.S. degrees in mechanical engineering and environmental engineering, M.S. degrees in watershed management and soil engineering, and a Ph.D. in engineering geology. He is licensed in California as a Geotechnical Engineer and Engineering Geologist. He has been an expert witness in more than 100 cases throughout the state.
Dr. Upp is active in multiple professional organizations. He has been a member of CalGeo since its SAFEA days and was President in 2011-2012. He is a past president of the Association of Environmental and Engineering Geologists (AEG) and is a Life Member of ASCE.
Mike is a Senior Principal Geotechnical Engineer in Shannon & Wilson’s Sacramento office and has nearly 21 years of experience with diverse and challenging, geotechnical and environmental projects in Sacramento and Northern California. Mike’s focus has been on water and wastewater, transportation, and vertical construction projects. Since joining Shannon & Wilson, Mike has been managing numerous large rail and transportation projects throughout the west.