• 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)