Leslie is a Fellow of the Institute and has held a variety of roles in both private and public sector organisations, latterly as a university lecturer in law and corporate governance. He is a Fellow of the Higher Education Academy and a reviewer and marker for the CGI Corporate Governance module.
He is a member of UKRIAT Committee, Nominations Committee, Assessment Review Panel and Chair of Qualifications Committee. As of 1 July 2020, he will Chair the Institute's Professional Standards Committee.
Leslie also currently sits on both First-tier (General Regulatory Chamber) and Upper Tribunal (Administrative Appeals Chamber) tribunals.