A Chartered Accountant, Mark joined Whiteside Cullinan in 2013. He graduated from the University of Ulster with both a B. Sc in Accounting and an M.Sc in Advanced Accounting. Mark became a Partner is the firm in January 2019. Mark has a keen interest in rugby and plays for CYM RFC. Mark has previously served as treasurer of his local GAA club Cuchulainn Gaels GAC and currently sits on the Executive Committee of Terenure Sports Club.