David J. Back, PhD, is currently Professor of Pharmacology, Department of Molecular & Clinical Pharmacology at the University of Liverpool, United Kingdom. He received his B.Sc. (1970) and his PhD degree (1972) in Pharmacology also from the University of Liverpool. Professor Back held previous positions as Lecturer in Veterinary Pharmacology, (Senior) Lecturer in Pharmacology and Reader in Pharmacology. David Back is a past member of several Medical Research Council Committees and the Committee of the British Pharmacological Society (Clinical section). He is a past Editor in chief of the British Journal of Clinical Pharmacology and currently a member of the Editorial Board of a number of journals Professor David Back has published as author or co-author nearly 400 publications. He has become an internationally well known specialist on HIV therapy with special interest in Pharmacokinetics, drug-drug interactions, therapeutic drug monitoring and pharmacological mechanisms of viral failure.