Daniel O. Clark, Indiana University (IMAGE) Indiana University Caption Regenstrief investigator Daniel O. Clark, Ph.D. is a Indiana University Center for Aging Research scientist. Credit Regenstrief Institute Usage Restrictions Photo credit to Regenstrief Institute License Licensed content 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.