Gary Russey
President
Principal Geologist

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Gary was one of the three founders of RGH in 1991.  He is experienced in performing and supervising fault studies, soil and geological studies, engineering geologic evaluations, water quality studies, laboratory and field testing, observation during fill placement and installation of foundations, keyways, subdrains, and buttress fills in California, Alaska, Nevada, Texas, and Louisiana.  

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Juan Hidalgo 
Geotechnical Engineer

Juan was also a founder of RGH and although recently retiring, continues to provide his vast expertise and knowledge for various projects.

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Travis Whitted
Vice President
Geotechnical Engineer

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Travis Whitted has managed and performed geotechnical studies for a wide variety of projects including wineries, public capital improvements, wastewater treatment facilities, pipelines, schools, fire stations, low and high density residential structures, recreational facilities, bridges, and commercial and industrial improvements.  Using high end computer software to analyze the stability of slopes is one of his specialties.  Applications include reservoir embankments subject to rapid drawdown, ancient landslides that may be subject to reactivation, and designing repair options for recent landslides and other slope related failures.  He has provided forensic analysis for structural failures and foundation stresses due to soil settlement, expansive soils, unstable slopes, and moisture intrusion in addition to roadway and pavement issues including inadequate subgrade support, utility trench settlement, and piping failures.   Mr. Whitted has extensive experience with grading projects ranging from hillside cuts and fills with keyways and subdrains to roadways and reservoirs. He has geotechnical engineering experience in Mendocino, Sonoma, Napa, Lake, Marin, and Monterey Counties.  

He enjoys spending time with his wife and three kids and if he can find spare time he likes hacking around the golf course and restoring and racing vintage cars. And if it requires buying a new tool, he will gladly take on a new project around the house!

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Tricia Langseth
Accounts Manager

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Tricia joined RGH in 2011. She has been working in the accounting field for engineering firms for 24 years. Dealing with invoicing, receivables, payables, and payroll, one way or another
the “money” comes, stops, and leaves by way of her desk.

When not at the office, she enjoys spending time with her family and scuba diving.

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Troy Webber
Field Engineer

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Troy is responsible for construction observation and testing and special inspections. His experience includes observation and testing of grading, keyway excavations, operations including asphalt paving, roadway subgrades, aggregate base materials, pipeline trenches, backfill, ponds, culverts, subdrains, buttresses, and concrete foundation elements including drilled piers, grade beams spread footings and post-tensioned slabs. With RGH since 2006, he has vast experience with geotechnical and materials testing and observation in Mendocino, Sonoma and Napa Counties. 

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Sean Flinn
Lab Technician

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Sean has many years of soils testing experience and holds multiple certifications.  In addition to testing soil and asphalt in the lab, Sean has many years of experience on a drill rig collecting soil and rock samples from sites all around California.  He is also an avid Giants fan...Go Giants!

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Trent Wood
Field Engineer

Trent is responsible for construction observation and testing. His experience includes observation and testing of grading, keyway excavations, operations including asphalt paving, roadway subgrades, aggregate base materials, pipeline trenches, backfill, ponds, culverts, subdrains, buttresses, drilled and driven piles, drilled piers, grade beams, footings and slabs. He has also inspected structural masonry construction for retaining walls, sound walls, and building structural members. He has over 19 years of geotechnical and materials testing and observation experience in Mendocino, Sonoma, Lake and Napa Counties.

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Keith Gregory 
Vice President

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Keith has served as Project Manager on a variety of projects including landfills, roadways, water and wastewater treatment and distribution facilities, commercial and industrial developments and power plants. With over 40 years of his career spent in Northern California, Mr. Gregory is thoroughly familiar with the region.

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Eric Chase
Vice President
Geotechnical Engineer

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Eric is responsible for geotechnical studies, design, consultation, and construction observation. His experience includes water and wastewater pipelines and treatment plants, power plants, port facilities, multi-story buildings supported on deep pile foundations, bridges, roadways, levees, hillside development, pump stations, and hospitals. He has also performed seismic and geologic hazard evaluations for various Army installations and Navy facilities throughout the western United States. He has 20 years of experience in geotechnical and earthquake engineering in the Bay area, San Diego, Humboldt County and the States of Alaska, Arizona, Washington, Nevada, Utah, and Kansas.

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Jared Pratt
Vice President 
Engineering Geologist

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Jared Pratt joined RGH in 2006 after working for a respected national firm for nearly 10 years. Mr. Pratt has provided geologic mapping and analysis for numerous Sonoma and MarinCounty projects and has experience working in Alameda, San Francisco, Mendocino, Napa and Lake Counties.  Mr. Pratt has managed several hundred individual projects including geotechnical studies for capital improvement projects, roadway improvement, commercial and residential development as well as construction inspection and testing programs.  He is extremely familiar with mapping and methods to locate, identify, and explore Bay Mud and soft soil deposits, having worked on dozens of Bay Mud projects throughout the North Bay.  Mr. Pratt has also specialized in hillside construction and landslide evaluation studies.  He has extensive experience with grading projects including roadway preparation, building site improvements and landslide repair.

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Ryan Padgett
Senior Geologist

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Ryan is responsible for developing and performing geologic and geotechnical investigations, including the associated laboratory testing programs and coordination with permitting agencies. He is responsible for geologic field mapping, drill and test pit logging, pile driving inspections, observation during fill placement and foundation excavations installation of keyways, buttressed fills, and subdrains. His experience includes pipelines, schools, government buildings, commercial facilities, multi-family subdivisions, single-family residences, wastewater reservoirs, roadway construction, and hillside grading.

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Josh Kilgore
Staff Geologist

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Sarah Lockwood
Project Geologist

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Ms. Lockwood is a Certified Engineering Geologist with ten years of experience in engineering geology, geotechnical engineering design and construction, hydrology, environmental remediation, and project management.  She has worked in the capacity of project manager, project geologist, and field technician on numerous projects in Marin, Sonoma, Napa, Lake, and Mendocino Counties. These projects include equestrian facilities, bridges, schools, hospitals, parks, residential and commercial developments, roadways, utilities, rail, watersheds and streams, reservoirs, landslides, ocean bluffs and sea-caves.  Ms. Lockwood personally performed the field investigation, geologic hazard reconnaissance, and report preparation for the entire SMART Train alignment and most of the station platforms between the Marin Civic Center and Airport Boulevard. Ms. Lockwood joined RGH in 2016 after eight years with another local geotechnical firm and two years managing capital improvements projects for a local craft brewery. 

When she's not adding to her rock collection, you can usually find Ms. Lockwood goofing off with her two children and dogs, training horses, practicing Taekwondo, or playing guitar well into the night. 

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​Steve Warner
Lab Technician
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Johnny Samarron
Field Engineer
​When not working Johnny enjoys family time with his son and wife as well as swimming, fishing, baseball, and bowling.