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.


A Human Factors expert studies the systematic relationship between people, technology, and the environment. The terms Human Factors and Ergonomics are synonymous. Human Factors as a field originated during World War II to improve human performance in complex systems. Failures due to human error created an urgent, fresh approach to focus on design for effective use of technology by people, particularly in challenging settings (Lipinski, U.S. Congressional Record, Extension of Remarks, October 22, 2015). During accident investigations and forensics, Human Factors practitioners apply theory, methods, data, and principles about people to address issues that arise from such interactions.

Joe Cohen is the Principal of Error Analysis, Inc. He oversees the firm’s contracting and directs the company business. Dr. Cohen is certified by the Board of Certification in Professional Ergonomics (BCPE) and as a Hazard Control Manager (CHCM). As an independent investigator of matters pending in State and Federal courts, he often addresses issues in premises, product, and traffic safety. Joe is a husband and father of two teens. He also enjoys guitars, baseball, and his pet Shih Tzu.

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. Dr. Harvey Cohen is a co-author of Slips, Trips, Missteps, and Falls: Causes and Prevention (3rd Edition, 2021), published with Lawyers & Judges Publishing Company, Inc. Harvey retired from consulting in 2017. He entered full retirement in 2023.


Error Analysis routinely reviews personal injury claims in litigation. This includes inspection and documentation of sites, facilities, processes, equipment, tools, and other systems. We analyze how people, materials, and environmental factors contribute to losses. We reconstruct or reenact safety-related events. Additionally, we apply our specialized knowledge to address risk to human life and limb, and other issues affecting peoples’ well-being. 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.

Call for current rates. Terms and conditions apply.

Joseph Cohen, Ph.D.




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