Author of 6 books: "Survivor's Guilt: The Secret Service and the Failure to Protect President Kennedy", "JFK: From Parkland to Bethesda", "The Not-So-Secret Service: Agency Tales From FDR To The Kennedy Assassination To The Reagan Era", "Who's Who In The Secret Service: History's Most Renowned Agents", "HONEST ANSWERS ABOUT THE MURDER OF PRESIDENT JOHN F. KENNEDY: A NEW LOOK AT THE JFK ASSASSINATION" and "THE PLOT TO KILL PRESIDENT KENNEDY IN CHICAGO."