• Gregory Axten
  • Principal Engineer
  • CEO & President

     Mr. Axten, co-founder of American Geotechnical, has an extensive qualified and skilled background as a civil/geotechnical engineer. His professional practice includes the fields of soil engineering, geology, foundation engineering, structural engineering, materials engineering, and hydrology. His technical responsibilities have included all phases of logistics, cost estimating, drilling, sampling, field and laboratory testing, engineering analyses, development of design criteria and construction recommendations, and resident engineering. Consulting has included the development of design criteria for major developments including residential, commercial, industrial and utility projects.

     Projects include: hillside residential developments, urban redevelopment, oil storage and water tanks, pipelines, bridges, multiplate arch structures, waterfront structures, storm drains, reservoir embankments, sewage disposal systems, as well as one of the largest deep space instrumentation facilities (230 foot diameter tracking antenna) ever proposed by NASA.

Professional Registrations

  • State of California, Geotechnical Engineer 103
  • State of California, Civil Engineer 26098
  • State of Nevada, Civil Engineer 12249
  • State of Colorado, Civil Engineer 33686
  • State of Arizona, Civil Engineer 34078
  • State of Oregon, Professional Engineer 83580
  • State of California, Registered Environmental Assessor, (REA) 01968

Professional Affiliations

  • American Society of Civil Engineers
  • California Geotechnical Engineers Association
  • National Society of Professional Engineers
  • American Society for Testing & Materials
  • United States National Society of ISSMFE
  • Geological Society of America
  • American Concrete Institute
  • Post-Tensioning Institute
  • Tau Beta Pi Honorary Association; Cal Poly, Pomona
  • National Groundwater Association
  • Structural Engineers Association
  • Edred Marsh
  • Principal Engineer
  • Partner & Division Director

     Mr. Marsh has been a part of American Geotechnical's team of professionals since 1988. Currently he is the Office Manager and Principal Engineer for the San Diego and Las Vegas offices. During the course of his professional career he has become an accomplished leader in the fields of geotechnical, civil and forensic engineering. He has been involved with projects throughout southwestern United States. Projects have included hillside developments, deep fill, expansive soil and other sensitive soil sites, Infrastructure design and construction consulting, liquefaction and dynamic soil evaluations, slope stability and landslide evaluation and stabilization, construction material corrosion assessments, concrete problem evaluations and moisture intrusion studies, among others.

     Because of his expertise in geotechnical engineering and other related subjects, Mr. Marsh frequently gives educational presentations for both public and private groups and serves as a professional expert for dispute resolution.

Professional Registrations

  • State of California, Registered Geotechnical Engineer 2387
  • State of California, Civil Engineer 50315
  • State of Nevada, Civil Engineer 12149
  • State of Colorado, Civil Engineer 33623
  • State of Arizona, Civil Engineer 41710

Professional Affiliations

  • American Society of Civil Engineers
  • Chi Epsilon National Civil Engineering Honor Society
  • ACI - American Concrete Institute
  • PTI- Post-Tensioning Institute
  • ASTM International
  • Arumugam Alvappillai
  • Principal Engineer
  • Partner

     Arumugam Alvappillai "Alva", Principal Engineer, Partner Alva has been a key professional at American Geotechnical since 1992. As a Senior Engineer, Mr. Alvappillai's primary responsibilities include diagnosing soil and foundation problems on a wide range of projects, consulting on new commercial development projects, as well as, structural design, and structural forensic evaluations. Other responsibilities include project management, planning of field investigations, analytical and computer analysis, and report writing.

     His professional and academic background, with a Ph.D. in Geotechnical Engineering has proven to be an invaluable asset while managing and working on various geotechnical-engineering projects in Southern California. In addition to the above, he has experience in structural analysis and design, particularly in the area of foundation engineering. Geotechnical experience includes projects related to settlement and expansive soil, foundation engineering, slope stability, landslide and earthquake engineering. He has experience and knowledge of the latest computer methods of analyzing complex problems using numerical methods. He also designed various structural systems such as mat slabs, pile foundations, and tieback systems for slope stability.

Professional Registrations

  • State of California, Registered Civil Engineer 53887
  • State of California, Registered Geotechnical Engineer 2504

Professional Affiliations

  • Associate Member, American Society of Civil Engineers
  • Member, Chi Epsilon, National Honor Society for Civil Engineers
  • Dr. Fei-Chiu Huang
  • Principal Engineer
  • Partner

     Dr. Huang began his professional career more than 19 years ago and has been with American Geotechnical since 1994. Dr. Huang received his Ph.D. degree from Northwestern University in 1993. His primary duties were focused on site characterization, analysis & interpretation of subsurface data, static & dynamic design and analysis of shallow and deep foundations, pavement design, liquefaction analysis, as well as earth retaining & stabilizing structures. He also performed field investigation testing & borehole logging and also investigated landslide & slope stability problems. His current duties includes client contact, proposal preparation, planning geotechnical and forensic investigations, engineering data analyses, foundation design and recommendations, project management, as well as report writing. Dr. Huang has involved various types of construction projects including new construction, grading, landslide stabilization, slope repair, etc.

     Dr. Huang also has more than twelve years of geotechnical forensic investigation experience. He has worked on various construction litigation projects for lawyers, homeowner associations, insurance companies, financial institutions, and major developers in California. He has investigated various foundation problems, and designed treatments including shallow and deep foundation repairs, retaining structures stabilizations, landslide/slope stabilizations, groundwater problems, and pavement rehabilitation, etc.

Professional Registrations

  • State of California, Registered Civil Engineer 55670
  • State of California, Registered Geotechnical Engineer 2601

Professional Affiliations

  • American Society of Civil Engineers
  • Geo-Institute International Society of Soil Mechanics and Foundation Engineering


  • California Stormwater Quality Association
  • Qualified SWPPP Developer (QSD)
  • Qualified SWPPP Practitioner (QSP)
  • Doug Santo
  • Chief Geologist

     Mr. Santo has more than 25 years experience in southern California in all aspects of the applied earth sciences. He has managed major infrastructure and development projects for public and private sector clients. He has provided engineering geology, hydrogeology, geotechnical engineering, and environmental services for projects ranging from tunnels, dams, bridges, railroads, landfills, hospitals, schools, commercial/industrial developments, large planned communities, and single family residences. He has extensive experience in project and construction management. He has managed the geotechnical aspects for design and construction of more than fifteen large planned communities in Santa Clarita, Palmdale, The Los Angeles Basin and Orange County. These projects involved many millions of yards of earthwork and the mitigation of complex geologic, hydrogeologic, and geotechnical hazards.

     He has been the reviewing geologist for more than 20 cities in southern and central California. He has been President/CEO, Vice President, or Principal Geologist at four respected consulting firms in southern California prior to joining American Geotechnical. Mr. Santo provides quality geotechnical, geological, and hydrogeological consulting services to achieve an efficient and successful venture. His recommendations are practical, cost-effective and tailored to each site to ensure a safe project that will perform well over time.

Professional Registrations

  • State of California, Professional Geologist 5917
  • State of California, Certified Engineering Geologist 1866
  • State of California, Certified Hydrogeologist 450
  • State of Arizona, Registered Geologist 30709
  • State of Idaho, Registered Geologist 860

Professional Affiliations

  • Association of Engineering Geologists
  • Geological Society of America
  • Seismological Society of America
  • American Geophysical Union
  • Bob Jones
  • Operations Manager

     Mr. Jones has 28 years of construction, inspection, and management experience and 17 years of geotechnical QA/QC experience performing as Operations Manager, Project Manager, Field Services Manager, Laboratory Manager, and Inspector of Record, Radiation Safety Officer. Specific responsibilities include Laboratory and Field Services over-site; assures compliance with CDPH, AASHTO, AMRL, CCRL, DSA, and Caltrans accreditations; provides training, supervision and review of laboratory and field staff, client interaction, proposal preparation, and cost estimates.


  • Radiation Safety Officer Cert. No. 15447
  • American Society of Certified Engineering Technicians 949430
  • Inspector – Environmental Assessment Association 77222
  • Certified Construction Inspector – Association of Construction Inspectors 6871
  • Concrete Field Testing Technician Grade 1 – American Concrete Institute 949430
  • Radiation Safety & Use of Nuclear Gauges – Campbell Pacific 28349
  • Caltrans Certificates of Proficiency – Concrete, Asphalt, and Soils
  • International Code Council – Professional Member 5065595
  • International Conference of Building Officials – Professional Member
  • National Institute for Certification in Engineering Technologies (NICET) 97537 (Concrete, Asphalt and Soils)
  • International Concrete Repair Institute 54074
  • ACI International – Professional Member
  • Construction Management Association of America 163118

Professional Affiliations

  • International Code Council - Professional Member
  • National Institute for Certification in Engineering Technologies (NICET)
  • International Concrete Repair Institute
  • ACI International - Professional Member
  • Construction Management Association of America