Martin is a solicitor and former partner of Pinsent Masons LLP, a Top 10 UK-based international law firm where he specialised in construction and infrastructure law. He retired from the partnership in 2017. He is an elected member of the CBI London Regional Council and a member of the CB1 Construction Council. He has been a governor/trustee of Cumnor House School in Danehill, trustee of the Barts Hospital Research and Development Trust, trustee of the Pinsent Masons Foundation and an ambassador for Arthritis Research UK. He has recently been appointed to the Elections Committee of the Royal Automobile Club. Martin lives in Newick with his wife, Jane. They have two children in their early 20s.