Dr. Nisen is CEO and Donald Bren Chief Executive Chair of the Sanford Burnham Prebys Medical Discovery Institute in La Jolla, California and Lake Nona, Florida. Previously, he was Senior Vice President, Science and Innovation at GlaxoSmithKline and held leadership roles as interim Chief Medical Officer, Senior Vice President and Head of Oncology Research and Development, and of Clinical Pharmacology and Discovery Medicine. In those roles he contributed to the successful discovery and development of multiple marketed products. He was a member of key governance, scientific advisory and investment Boards at GlaxoSmithKline. Formerly, he was the Lowe Foundation Professor of Neuro-oncology at the University of Texas Southwestern School of Medicine, then Vice President, Cancer Research at Abbott Laboratories.