He was elected EMIG Chairman in 2005 and has been instrumental in the metamorphosis of EMIG from being a business/networking group to the influential trade association it is today. In 2005, EMIG began with 17 Member Companies and today, has 260+, of which, 90% choose to be represented only by EMIG. Consequently, EMIG represents c. 50% of UK branded medicines. In July 2014, Leslie was elected VP, European Confederation of Pharmaceutical Entrepreneurs (EUCOPE). He was Vice Chairman of the NICE Project Development Group for Local Formularies Good Practice Guidance, a member of the NICE Medicines Optimisation Guidance Development Group and was recently appointed as an Expert Adviser to the NICE Centre for Clinical Practice.
He was a member of the Accelerated Access Review Reference Group and a member of the Cancer Drugs Fund Working Group. He has published numerous articles, is a frequent speaker at national and international seminars, a Member of the Scottish Government’s Strategic Engagement Group, a Member of MENSA and is a visiting lecturer at the University of Cambridge.