Dr. Walterscheid received his Bachelor of Science degree in Chemistry from the University of Texas at Austin, and his Ph.D. in Immunology from the UT Graduate School of Biomedical Sciences in Houston. He also completed his training as a Postdoctoral Fellow in the Division of Atherosclerosis and Vascular Medicine at Baylor College of Medicine at the Texas Medical Center in Houston. 

In 2007, he joined the Harris County Institute of Forensic Sciences as a Toxicology Specialist and was later promoted to Assistant Chief Toxicologist. In late 2015, Dr. Walterscheid became Chief Toxicologist at the Armed Forces Medical Examiner System where he oversees toxicology laboratories supporting the AFMES mission of investigating deaths and improving personnel readiness throughout all branches of the military. 

Dr. Walterscheid consults for local and regional AFMES pathology staff among other federal and military agencies such as the Department of Defense, Army Criminal Investigation Division, Naval Criminal Investigative Service, Air Force Office of Special Investigations, Department of Justice, Federal Bureau of Investigation, and the US State Department as an expert for interpreting toxicology results from DWI suspects, victims of sexual assault, and postmortem investigations.