A Fellow of the Royal Historical Society and a leading expert among a new generation of intelligence historians, he specialises in British covert operations and the secret pursuit of foreign policy. He has published widely on intelligence and security issues and regularly appears on radio and television. Cormac is the co-author of The Black Door: Spies, Secret Intelligence and British Prime Ministers and featured on Channel 4's Spying on the Royals. He is the author of Disrupt and Deny: Spies, Special Forces, and the Secret Pursuit of British Foreign Policy, published by Oxford University Press.