Dr. Nancy Grugle is a Board-Certified Human Factors Professional (CHFP) with over 20 years of academic, research, industry and forensic experience in human factors. She is the owner and founder of Cognizant Forensics, a human factors expert witness firm specializing in human factors in transportation safety. Dr. Grugle's areas of specialization include fatigue, sleep deprivation, and drowsy driving, as well as driver actions, distracted driving, perception-reaction time, looming, nighttime visibility/conspicuity, expectancy and positive guidance, and driver assistance technologies.

Dr. Grugle has conducted hundreds of forensic investigations and has testified in both state and federal courts. She takes cases nationwide and conducts investigations for both plaintiff and defense counsel.