Mark was born in 1970 and raised in Kimbolton near Huntingdon. He was educated at Kimbolton School and on leaving spent a gap year Commission in the Army based in Hong Kong with the Queens Gurkha Engineers. He then went on to read Business Studies at Buckingham University and completed an MBA at Exeter University, before returning to help run the family business, Kimbolton Fireworks.
During this period, Mark transferred his commission to the Army Reserve in 1990 and during 29 years military service has commanded a Royal Engineer Bomb Disposal Squadron and deployed on operational service to Kosovo, Bosnia and Afghanistan. Awarded the Territorial Decoration in 2002, Mark received his second long service medal, the VRSM in 2011 and Bar in 2016. He continues to serve as a Colonel in the Royal Engineers and has been selected as Deputy Commander 77 Brigade.
Mark's political career started as a local councillor in Huntingdon before becoming the first pyrotechnician to be elected to the House of Commons in 2005. After holding posts as Opposition Whip, Shadow Minister in the Department for International Development and Lord Commissioner of the Her Majesty's Treasury, Mark was appointed Parliamentary Under Secretary of State for Defence Personnel and Veterans following the 2015 General Election. He is married to Caroline Dinenage MP.
Immediately after the General Election of 2017 Mark was appointed Minister of State for the Armed Forces which was followed by an appointment to the Privy Council in November of the same year.
In March 2018 Mark was sworn in as The Right Honourable Mark Lancaster, a member of Her Majesty’s Most Honourable Privy Council.
Following the election of Boris Johnson as the new leader of the Conservative Party in July 2019 Mark was reappointed in his role at the Ministry of Defence.