Labcorp Specialty Labs MEDTOX Search Home / About Us / Staff Staff Jennifer A Collins, PhD, F-ABFT, PHCERT-CC VP of Operations, Occupational Testing Services | Discipline Director, Forensic Toxicology | Director, MedTox Forensic Laboratory Dr Collins is a fellow of the American Board of Forensic Toxicology and holds certification as a high-complexity laboratory director (HCLD) from the American Board of Bioanalysis. She earned a Bachelor of Science from the University of Michigan, her PhD from Northwestern University, and a Public Health Certificate in Core Concepts (PHCert-CC) from the University of Minnesota. Dr Collins has been with MedTox since 1991. She is a member of the American Association of Clinical Chemistry (AACC) and the Society of Forensic Toxicologists (SOFT). She performs laboratory inspections on behalf of the College of American Pathologists (CAP) and the Substance Abuse and Mental Health Services Administration (SAMHSA) National Laboratory Certification Program. She is a member of the CAP Toxicology Resource Committee and is on the editorial advisory board of Clinical and Forensic Toxicology News. Gregory Clark Janis R&D Technical Director Mr. Janis earned undergraduate degrees in biochemistry and chemistry at Virginia Tech and an MS in toxicology at the University of North Carolina. He has two decades of experience developing techniques for the analysis of pharmaceuticals and drugs of abuse. Current interests include high-throughput mass spectrometry screening techniques, as well as the identification and analysis of new and emerging drugs of abuse. He is a member of the American Society for Mass Spectrometry and the Society for Forensic Toxicologists. Karla J Walker, PharmD, DABCC, FACB Clinical Laboratory Directory | Discipline Director, Clinical Toxicology Dr Walker is a directorate of the American Board of Clinical Chemistry in toxicological chemistry and a fellow of the National Academy of Clinical Biochemistry. She has an undergraduate degree in medical technology from Minnesota State University, Mankato, and a doctorate in pharmacy from the University of Minnesota, Minneapolis, where she also completed a postdoctoral fellowship in pharmacokinetics. Dr Walker has been with MedTox for more than 25 years. She is a member of the American Society of Clinical Pathologists, American Pharmacists Association, and the American Association for Clinical Chemistry. Legal Menu Privacy Statement and Terms of Use Notice of Nondiscrimination Combatting Modern Slavery and Human Trafficking Statement © 2021 Laboratory Corporation of America® Holdings. All Rights Reserved.