John Greenacre spent twenty four years in the British Army before as a logistician, helicopter pilot and staff officer. John is a graduate of the Advanced Command and Staff Course (ACSC) and retired from the Army in 2011. John received his PhD in history from the University of Leeds. His thesis on the development of British airborne forces during the Second World War was published in 2010 and he has subsequently written and lectured extensively on the subject.

John has been battlefield guiding since 2001. His unique experience across a diverse array of military disciplines and environments, coupled with his academic record allows him to comment with authority on battlefield subjects from logistics to air support. He works frequently with military groups from battalion and regiment level up to 3 Star headquarters across a wide range of campaigns and theatres. John received his Guiding Badge from the Patron of the Guild, Professor Richard Holmes, at Woolwich on Saturday 28th November 2009.

When not guiding John is employed as a lecturer in history at the University of Suffolk in Ipswich.