Error Analysis, Inc.

A Human Factors and Safety Consultancy.

Our work involves forensics, expert witness assignments in civil litigation, and projects. For thirty years, we have advised legal, insurance, public, and private clients with our specialized expertise about human behavior, design, and safety.  

Error Analysis, Inc.


The discipline of Human Factors, otherwise known as Ergonomics, originated during World War II to improve human performance in complex systems. Costly failures due to human error created an urgent, fresh approach to inform how technology is designed and maintained. The Human Factors approach emphasized the importance of lessons learned in field work and research in behavioral science involving people. Generally, the work of a modern Human Factors professional, otherwise known as a Human Factors Engineer or Ergonomist, involves studying and applying evidence about how technology and humans interact. At its core, the field involves investigation and analysis encompassing the role of human behavior in design and management.

Dr. Joe Cohen is the Principal Consultant for Error Analysis. Joe is a board-certified Human Factors Professional (CHFP) and Hazard Control Manager (CHCM). During his career, Joe has personally investigated more than a thousand injury cases for legal clients in fourteen American states. As a consultant or expert retained for litigation, Joe routinely addresses Human Factors issues in premises safety, product warnings, and forensic aspects of human performance in traffic crashes. His career project work has included clients such as Boeing, Con Edison, Zamboni Company USA, United Brotherhood of Carpenters, and the Coffee Bean & Tea Leaf.

H. Harvey Cohen founded Error Analysis. His work significantly advanced the practice of Human Factors in claims and litigation, most notably in the areas of occupational safety and personal injury. This followed a celebrated career of public service, scientific research, consulting, and writing. Among several other books, Dr. Harvey Cohen is a co-author of Slips, Trips, Missteps, and Falls: Causes and Prevention (3rd Edition, 2021), published by Lawyers & Judges Publishing. Harvey retired from consulting in 2017. He entered full retirement in 2023.


Error Analysis routinely reviews personal injury claims in litigation. Our work may include inspection and documentation of accident sites, facilities, processes, equipment, tools, and other systems. We analyze how people, materials, and environmental factors combine to produce loss. This may include reconstructing or reenacting certain events. Our typical cases involve falls, collisions, exposures, and repetitive motion injuries. We specialize in hazards and risk, standards and violations, warnings and instructions, unsafe acts, attention and decision-making, hazard response and avoidance, impairments, and the fundamentals of biomechanics. 

Rates are available upon request.


Outside the justice system, Error Analysis engages in projects that call for a specialist. This includes workplace studies or safety audits, workspace solutions (e.g., workstations), program development and evaluation, education, training, writing, standards development, research, start-ups, and more.

Contact us about your project needs.

Error Analysis, Inc.


Joe Cohen is a credentialed Human Factors professional with a broad domestic and international experience base. His legal cases typically involve premises liability, general negligence, motor vehicle, and/or products liability actions. Dr. Cohen has testified as an expert witness in Superior Courts of California and Arizona, District Court of Clark County, Nevada, and United States District Court, District of Nevada. His project experience includes contributing to the Federal Aviation Administration (FAA) Human Factors Design Standard, consulting on design of warnings and instructions for consumer and industrial products, safety and risk management, and publications. Joe is a husband and father of two teens. He also enjoys guitars, baseball, and his pet Shih Tzu.

Call for current rates. Terms and conditions apply.

Joseph Cohen, Ph.D.




Error Analysis, Inc.
5173 Waring Road, Suite 157
San Diego, CA 92120