Leslie has been an Associate member of ICSA since 1972 and a Fellow since 1997. After working in the Insolvency Service and then as a director of both transport and mining companies, he lectures in Employment Law and Corporate Governance at Edinburgh Napier University and in Hong Kong.
He chairs the Law Review Group and is a member of the Assessment Review Panel, Qualifications Committee and Professional Standards Committee.
Leslie currently sits on both First-tier (General Regulatory Chamber) and Upper Tribunal (Administrative Appeals Chamber) tribunals. He is a member of the Institute of Logistics and Transport and a Fellow of the Higher Education Academy.