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Driver Fatigue & Forensic Human Factors Analysis for Accident Reconstruction - Expert Witness

D. Wylie Associates

D. Wylie Associates

P.O. Box 60836
Santa Barbara, California 93160

Phone(805) 681-9289
Fax (805) 681-9299


Expert WitnessForensic ExpertSpeaker
Dennis Wylie is an internationally recognized human factors expert concerning driver error; inattention and improper lookout; driver fatigue; car, truck and bus driver skill and knowledge requirements; driver and motor carrier standards of care; hours of service violations; circadian rhythms; sleep debt; impaired vigilance, alertness, decision making, reaction time, and control responses.


Mr. Dennis Wylie is a forensic expert competent in the following areas:

- Driver Fatigue

The nature and relative importance of the various causes of driver fatigue, and the specific effects of fatigue on driver performance.

- Driving Safety

The human factors engineering and scientific aspects of driving safety, including driver skill and knowledge requirements for the various classes of vehicles, the basis of the Commercial Driver License (CDL) system, and the safety responsibilities of truck and bus drivers and motor carriers.

- Forensic Human Factors Analysis for Accident Reconstruction

The forensic driver fatigue expert can often conclude to a reasonable degree of scientific certainty whether fatigue was a cause of an accident by doing a human factors accident reconstruction involving two important steps:

a forensic human factors analysis of the driver's work-rest history leading up to the accident, and
a forensic human factors analysis of each particular aspect of the driver's performance that may have been a cause of the accident.

Litigation Support Services

D. Wylie Associates provides forensic human factors analysis and expert witness services for defense and plaintiff's counsel, insurance companies, the transportation industry, and government departments of transportation.

Areas of Expertise


D. Wylie Associates is a consulting firm established in January, 1997 to provide transportation human factors research, driver fatigue consulting, and expert witness services for defense and plaintiff's counsel, insurance companies, the transportation industry, and government departments of transportation. D. Wylie Associates has served the U.S. Department of Transportation, Transport Canada (Canada's counterpart to the US Department of Transportation), the California Department of Education, and defense and plaintiff's attorneys.

Dennis Wylie is the firm's principal consultant. Collaboration as needed to suit each client's needs is conducted with colleagues in the fields of physiology, medicine, and sleep disorders.

Dennis Wylie is a board-certified professional ergonomist with more than 30 years' experience as a human factors/ergonomics specialist. A graduate of the University of California at Santa Barbara, he joined the pioneering firm of Human Factors Research, Inc. in 1967, where his mentors in human factors were some of the founders of that branch of science. He specialized in vigilance and operator performance, and in the last 15 years has focused on human factors in driving. He was Vice President and Senior Staff Scientist of Human Factors Research, Inc., and a Principal Scientist at Essex Corporation before starting his own firm in 1997. (Mr. Wylie's curriculum vitae is available upon request.)

Consulting Practice

All States

More Information

Driver Fatigue Expert Witness
D. Wylie Associates Services
About Dennis Wylie, Litigation Support
Expert Services Provided by D. Wylie Associates
Forensic Human Factors Analysis, Expert Witness
Contact D. Wylie Associates, Forensic Consultant

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Professional References

Client references are available upon request.


University of California
Santa Barbara, CA

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