Dr. Jeffrey Jentzen received is medical school training at Wayne State Medical School in Detroit, Michigan. He completed a pathology residency and forensic fellowship at Hennepin County Medical Center in Minneapolis, Minnesota. He was the chief medical examiner for Milwaukee County Wisconsin from 1987 to 2008. During that time he completed 45,000 death investigations, personally performed 6000 autopsies, and testified in courts throughout the United States. While in Milwaukee, he investigated the Jeffrey Dahmer case and over 2500 homicide cases. He received a PhD in medical history from the University of Wisconsin in 2007. He has been credited with creating the American Medicolegal Death Investigator Board and Forensic Autopsy Standards. He was the 2008 president of the National Association of Medical Examiners, a national organization representing some 900 medical examiners in the U.S. and internationally.  In 2008, Dr. Jentzen joined the faculty of the University Of Michigan Department of Pathology as the Director of Autopsy.

 Pharmacogenomics (the study of genetic influence on drug deaths), standards development in Forensic Pathology, medical history