Frederick is a retired New Jersey State Police Detective/Lieutenant. He was the Executive Director of the Pennsylvania Crime Commission. Martens has worked undercover during the 1970s, conducted investigations of organized crime and public corruption has been qualified as an expert on organized crime in both federal and state courts, and has served as an integrity monitor during the search and recovery efforts at the site of the former World Trade Center and its rebuilding. He has been contracted by the City of New Orleans to investigate fraud and procurement abuse post Hurricane Katrina and served as a monitor on a construction project in Derry, Northern Ireland.
Martens is a charter member of the Vidocq Society, former President of IASOC, and has taught at Pennsylvania State University and The College of New Jersey. He has lectured throughout the world on organized crime, racketeering, and public corruption. He has a master’s degree from Fordham University and John Jay College of Criminal Justice. He is a prolific book reviewer for Rutgers University School of Criminal Justice. Police Intelligence in Crime Control, which he co-authored was recognized by IAELIA for its outstanding contribution to the advancement of the intelligence profession.