Toxicologist
Harris County Medical Examiners Office
Professor Department of Pathology and Human Identification
Director UNT System Center for Human Identifcation
University of North Texas Health Science Center at Fort Worth
Fire investigator
Scientific Fire Analysis, LLC
Assistant Laboratory Director
US Postal Inspection Service
Toxicology Laboratory Director
Harris County Medical Examiners Office
Associate Medical Examiner
Georgia Bureau of investigations
Professor of Pharmacology and Cancer Biology
Professor of Biological Psychiatry
Duke University Medical Center
Director
Fort Worth Crime Lab
Chief Forensic Toxicologist
Fort Worth Crime Lab