35-year credentialed investigator, multi-state licensed, certified in multiple forensic disciplines, including bloodstain analysis. Also certified as a surveillance specialist and in criminal interview techniques. Former informational and operational asset for the FBI and US Department of Justice (1994-1999). Certified in cold case homicide investigation, including forensic pathology and prosecution preparation. Former EMT-P, EMT instructor and and CPR instructor-trainer (1977-1980). Published author and columnist.

Hagmann now hosts (the Hagmann Report) a popular radio and video talk show. He is the author of Stained By Blood, A Murder Investigation and his latest, In The Dark Of Night, Blood Of The Innocent.