Christopher Callahan, Indiana University Center for Aging Research (image) Indiana University Share Print E-Mail Caption Indiana University Center for Aging Research Founding Director Christopher Callahan, M.D. is a Regenstrief Institute Investigator and the Cornelius and Yvonne Pettinga Professor of Medicine at Indiana University School of Medicine. Credit Regenstrief Institute Usage Restrictions Photo credit to Regenstrief Institute Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.