Dr. Lesley Russell has been a director since December 2009.

Dr. Russell is currently Executive Vice President and Chief Medical Officer of Cephalon. Prior to joining Cephalon in 2000, Dr. Russell worked for several pharmaceutical organizations, including Amgen and Eli Lilly. Before joining the pharmaceutical industry, she was trained in hematology/oncology at Royal Infirmary of Edinburgh and at Royal Hospital for Sick Children in Edinburgh, UK and was a Research Fellow at University of Edinburgh Faculty of Medicine. Dr. Russell received a MB.Ch.B. degree from the University of Edinburgh, Scotland, Faculty of Medicine. She is a member of the Royal College of Physicians, UK, and is registered with the General Medical Council, UK.