Larry Pierson

Geologist and Engineering Geologist
Oregon, Washington

2000 - present
Senior Associate Geologist Landslide Technology

1978 - 2000
Chief Engineering Geologist Oregon Department of Transportation

1975 B.S.
University of California Los Angeles

National Academy of Science, Transportation Research Board, Committee on Engineering Geology

National Academy of Science, Transportation Research Board, Subcommittee on Rockfall Management

Member-author TRB Task Force AFP 15T publication on Rockfall Evaluation and Control

Member, Association of Engineering Geologists

Member, American Rock Mechanics Association

Member, International Society of Rock Mechanics

U.S. Representative (Debate Panel) to 11th International Congress of the International Society of Rock Mechanics; Lisbon, Portugal



Lawrence A. Pierson
Senior Associate Geologist

Mr. Pierson has over 36 years of experience in engineering geology, and is a nationally recognized expert in the field of rock mechanics with a specialty in transportation projects. Twenty-two years of his experience were with the Oregon Department of Transportation where he served as a Geotechnical Manager and Chief Engineering Geologist. He was responsible for rock slope and rockfall mitigation designs, foundation evaluations for structures, and managing quarry operations and transportation research projects. As part of national pooled-fund research projects, he has developed management and design systems including the Rockfall Hazard Rating System (RHRS) used by U.S. and Canadian transportation agencies as a rock slope management tool, and a national transportation guideline for design of rockfall catchment areas (RCAD).

With Landslide Technology Mr. Pierson has managed major geotechnical projects for the Federal Highway Administration, State DOTs and regional utility companies. He has managed the development of geotechnical procedure manuals and has provided expert witness services on several rockfall litigations and construction claims for transportation agencies.

A few projects representative of Mr. Pierson’s experience include: