Este Senior Fellow la National Security Archive, unde a condus programe de documentare in privinta relatiilor chino-americane, activitatii mlitare in spatiul cosmic, organizarii si operatiilor serviciilor de informatii americane etc. A scris mai multe carti despre spionaj si serviciile de informatii, cele mai recente fiind A Century of Spies: Intelligence in the Twentieth Century (1995), The U.S. Intelligence Community (1999), America's Space Sentinels: DSP Satellites and National Security (1999), The Wizards of Langley: Inside the CIA's Directorate of Science and Technology (2001).