Robert J. Groden (born November 22, 1945) is an American author who has written extensively about conspiracy theories regarding the assassination of U.S. President John F. Kennedy. His books include The Killing of a President: The Complete Photographic Record of the JFK Assassination, the Conspiracy, and the Cover-up; The Search for Lee Harvey Oswald: A Comprehensive Photographic Record; and JFK: The Case for Conspiracy (shorter version than his 1975 co-authored book). Groden is a photo-optics technician who served as a photographic consultant for the House Select Committee on Assassinations.A harsh critic of the Warren Commission, he also testified at the 1975 United States President's Commission on CIA activities within the United States (sometimes referred to as the Rockefeller Commission).