St John spent 20 years in the British Army before embarking on a career in investment banking at Bank of America and HSBC, where he held  a series of business management roles and headed the latter's Corporate Access team.  In 2016 he joined Rampart Capital, a multi family office focused on alternative investments, as the Investment Director/Operating Partner.  More recently, St John has undertaken a number of board advisor and Interim COO roles and is a mentor for business in the Goldman Sachs 10,000 small businesses, UCL Concept X and Heropreneur programmes.  He has an MBA from Cranfield University and a Masters in International Studies from Kings College, London where he was also a Research Fellow.