Andy McNab joined the infantry in 1976 as a boy soldier. In 1984 he was badged as a member of 22 SAS Regiment. He served in B Squadron 22 SAS for ten years and worked on both covert and overt special operations worldwide, including anti-terrorist and anti-drug operations in the Middle and Far East, South and Central America and Northern Ireland.

Trained as a specialist in counter terrorism, prime target elimination, demolitions, weapons and tactics, covert surveillance and information gathering in hostile environments, and VIP protection, McNab worked on cooperative operations with police forces, prison services, anti-drug forces and western backed guerrilla movements as well as on conventional special operations. In Northern Ireland he spent two years working as an undercover operator with 14th Intelligence Group, going on to become an instructor.

McNab also worked as an instructor on the SAS selection and training team and instructed foreign special forces in counter terrorism, hostage rescue and survival training.

Andy McNab has written about his experiences in the SAS in two bestselling books, Bravo Two Zero (1993) and Immediate Action (1995). Bravo Two Zero is the highest selling war book of all time and has sold over 1.7 million copies in the UK. To date it has been published in 17 countries and translated into 16 languages. The CD spoken word version of Bravo Two Zero, narrated by McNab, sold over 60,000 copies and earned a silver disc. The BBC's film of Bravo Two Zero, starring Sean Bean, was shown on primetime BBC 1 television in 1999 and released on DVD in 2000.

Immediate Action, McNab's autobiography, spent 18 weeks at the top of the bestseller lists following the lifting on an ex-parte injunction granted to the Ministry of Defence in September 1995. To date, Immediate Action has now sold over 1.4 million copies in the UK.

McNab is the author of seven fast action thrillers, highly acclaimed for their authenticity and all Sunday Times bestsellers. Published in 1997, Remote Control was hailed as the most authentic thriller ever written and has sold over half a million copies in the UK. McNab's subsequent thrillers, Crisis Four, Firewall, Last Light , Liberation Day , Dark Winter , Deep Black and Aggressor have all gone on to sell equally well. The central character in all the books is Nick Stone, a tough ex-SAS operative working as a 'K' on deniable operations for British Intelligence.

McNab's fiction draws extensively on his experiences and knowledge of Special Forces soldiering. He has been officially registered by Neilsen Bookscan as the bestselling British thriller writer of the last year.