Gary T. Yamaguchi, Ph.D., P.E., NCEES

Principal Consultant

Forensic Services



Dr. Gary Yamaguchi received his Ph.D. in Mechanical Engineering (Design Division, Biomechanics) from Stanford University, his S.M. (Masters) in Mechanical Engineering from MIT, his B.S. in Engineering & Applied Science from Caltech, and his A.B. in Physics from Occidental College. His consulting practice focuses on determining biomechanical mechanisms of injury, reconstructing both vehicular and biomechanical accidents based on evidence. His areas of practice include analyses of low-speed and high-severity vehicular accidents, vehicle-to-pedestrian impacts, spinal injuries, slips, trips, and falls, fall protection systems, sports injuries, mechanical design, product liability, and premises liability.

Dr. Yamaguchi is also a registered Professional Engineer (Mechanical) with significant expertise in modeling and analyzing the dynamics of human body motions. As a professor at Arizona State University, he conducted original research to improve orthopedic surgical procedures, develop neural-controlled prostheses, analyze human gait and stance, model animals used in spinal cord injury research, and design devices for persons with disabilities (rehabilitation engineering). He taught courses in biomechanics, muscle physiology, engineering design, and bioengineering fluid dynamics. His research was funded by the National Science Foundation and the Whitaker Foundation.

Dr. Yamaguchi has contributed to numerous journal articles and book chapters, and over 100 additional publications in official reports, proceedings, and transactions in the fields of injury biomechanics, accident reconstruction, musculoskeletal dynamics, movement simulation, neuromuscular coordination and control, rehabilitation engineering, and magnetic fusion energy. He is the author of a monograph book, Dynamic Modeling of Musculoskeletal Motion – A Vectorized Approach to Biomechanical Analysis in Three Dimensions, published by Kluwer Academic Publishers (2001) and Springer (2006).


• Physics 3/2, A.B.: Occidental College (1979)

• Engineering & Applied Science, B.S.: California Institute of Technology (1979)

• Mechanical Engineering, S.M.M.E.: Massachusetts Institute of Technology (1981)

• Mechanical Engineering (Design Division), Ph.D.: Stanford University (1989)

• Licensed Professional Engineer: Alaska (#ME-171592); Arizona (#49143); California (#M 35961); Oregon (#101391PE); Texas (#102904); Washington (#20107804); NCEES National Record