John Katzenellenbogen, PhD is a Founder of Radius and is the Swanlund Professor of Chemistry at the University of Illinois at Urbana-Champaign. Dr. Katzenellenbogen’s research is focused on aspects of the structure, function, and use of steroid receptors. He has prepared and evaluated receptor ligands having novel structures and activities and developed radiolabeled steroids for imaging receptor-positive tumors of the breast and prostate by positron emission tomography. More recently, Dr. Katzenellenbogen has initiated biochemical and biophysical studies on the dynamics of the estrogen receptors and their interaction with coregulator proteins. Dr. Katzenellenbogen is a Fellow of the American Academy of Arts and Sciences. He has given numerous named lecture presentations and received three NIH MERIT awards, the Paul C. Aebersold Award from the Society of Nuclear Medicine, and a Cope Scholar Award from the American Chemical Society. Dr. Katzenellenbogen conducted graduate studies with Professor E.J. Corey at Harvard University and received a PhD from Harvard University.