Andy McNab joined the infantry as a boy soldier. In 1984 he was 'badged' as a member of 22 SAS Regiment and was involved in both covert and overt special operations worldwide. During the Gulf War he commanded Bravo Two Zero, a patrol that, in the words of his commanding officer, 'will remain in regimental history for ever'. Awarded both the Distinguished Conduct Medal (DCM) and Military Medal (MM) during his military career, McNab was the British Army's most highly decorated serving soldier when he finally left the SAS in February 1993. He wrote about his experiences in two phenomenal bestsellers, Bravo Two Zero, which was filmed in 1998 starring Sean Bean, and Immediate Action.

Besides his writing work, he lectures to security and intelligence agencies in both the USA and UK.