Robert E. Walker was selected for the crime scene unit in 1995 and remained in the craft for the next 20 years, participating in some of the highest profile cases within his jurisdiction. During his tenure, he served as a police academy instructor, earned the IAI's Certified Crime Scene Investigator rating, and served as an expert witness in federal and state courts. In 2017, he was asked to contribute training materials to the United Nations Office of Drug Control and Crime Global Firearms Programme. Walker is a graduate of Barry University and received training from the FBI Academy at Quantico, the Office of the Chief Medical Examiner in New York City, and the Miami-Dade Police Department. He is the author of Cartridges and Firearm Identification.