Dr. Corbett is a forensic toxicologist with over 30 years of full-time experience. He received a Ph.D. in chemistry from the University of Toronto and an LL.M. from Osgoode Hall Law School at York University. He is a Fellow of the American Academy of Forensic Sciences and the Chartered Society of Forensic Sciences, and a member of numerous other professional organizations such as the Society of Forensic Toxicologists. He is the immediate past-president of the Medico-Legal Society of Toronto. He initially worked for 13 years as a forensic toxicologist for the Province of Ontario, and thereafter continued a full-time diverse consulting practice in forensic toxicology for more than 20 years. He was an adjunct professor in forensic science at the University of Ontario Institute of Technology for 10 years. He is a consultant inspector for the National Laboratory Certification Program in workplace drug testing. He has presented on research at forensic science conferences and education in legal programs. He has testified more than 950 times as an expert witness on alcohol, drugs and impairment/intoxication in cases involving death, injury and other aspects.