Bob Hamer spent twenty-six years as a "street agent" for the FBI, many of them in an undercover capacity. In assignments lasting anywhere from a day to more than three years, he successfully posed as a drug dealer, contract killer, fence, pedophile, degenerate gambler, weapons dealer, and white-collar criminal.

Bob worked undercover against such diverse groups as La Cosa Nostra, the Sicilian Mafia, Mexican Mafia, Russian Mafia, Asian organized crime groups, and Los Angeles-based street gangs. His successful infiltration of NAMBLA (North American Man/Boy Love Association) resulted in the arrest of what one defendant called eight members of the "inner circle."

He received numerous awards throughout his career including the FBI Director’s Award for Distinguished Service, four United States Attorney Awards for Distinguished Service, and numerous letters of commendation including one from then U.S. Attorney Rudy Giuliani.

Now retired, he is a member of the Writers Guild of America and the Writers Guild of Canada and has written for TV. He also worked as the technical advisor for The Inside and Angela's Eyes and has consulted for Law & Order: SVU and Sleeper Cell. He appeared as a guest on The Oprah Winfrey Show, The Sean Hannity Show, Laura Ingraham, and other national and local TV and radio programs to discuss his role in the NAMBLA investigation.

In 2009, The Last Undercover was named as the Fifteenth Annual San Diego Book Awards Association, Best Memoir, General Interest.

A Marine Corps veteran and law school graduate, he is married and has two children.