Mark qualified as a chartered accountant in 1996 with E&Y and joined Credit Agricole CIB London in 1997. In 1999 Mark moved internally to the front office Money Market Desk to manage the GBP book, progressing to the position of Head of Money Markets London in 2005. In 2008 Mark joined the Prudential Risk Division of the Financial Services Authority as a Liquidity & IRRBB risk specialist.

During his time at the FSA Mark progressed to the position of technical specialist and was a key contributor to the design of FSA's ILAS liquidity regime and SLRP process. Mark was a key supervisory partner to the prudential supervision teams and during 2008 and 2009 interacted directly with senior executives of the FSA, Bank of England, HM Treasury and the largest regulated firms.

In 2011 Mark joined HSBC Group initially as Group Head of ALM control quickly progressing to Group Head of Liquidity and Structural Interest Rate Risks. In January 2017 Mark was appointed Group Commercial Treasurer focussing on commercial optimisation and partnering with the Global Businesses and is a member of the Group Treasurer's management team and a member of the HSBC Group ALCO.