Dr. Tierney is Chancellor's Professor in the Department of Medicine. He is a Senior Investigator in the Regenstrief Institute where he has studied the effects of innovative, computer-based interventions to improve health care quality and lower costs. He is also Director of Research for the Indiana University Kenya Program where he is responsible for a major HIV/AIDS research program in collaboration with Moi University. He is the leader of the team of Americans and Kenyans that has implemented the first ambulatory electronic medical record system in sub-Saharan Africa that now contains more than 500,000 visit records for more than 30,000 HIV-infected patients being cared for in 18 urban and rural primary care and HIV clinics in western Kenya. This system is now being implemented in Tanzania and Uganda and is the reporting center for East Africa in NIH's world-wide epidemiology initiative to evaluate care and outcomes of treatment of HIV-infected persons.

Dr. Tierney is the Director of the Agency for Healthcare Research and Quality's National Resource Center for Practice-Based Research Networks (PBRNs). A practicing primary care general internist, Dr. Tierney also leads ResNet, a PBRN within IU Medical Group-Primary Care's 26 inner-city and suburban primary care practice sites, with more than 250 physicians and 150,000 adult and pediatric patients who make more than 350,000 visits per year to IUMG-PC sites. Over its 30-year history, ResNet has hosted more than $30 million in extramurally funded studies and published more than 300 articles in peer-reviewed medical journals. Dr. Tierney has received more than $20 million in grants as principal investigator from federal agencies and research foundations and has published more than 200 articles in peer-reviewed journals, two-thirds as first or senior author. In addition to informatics-based health services research, he has also performed dozens of epidemiologic studies utilizing the clinical data stored in the repositories created by Indiana University in Indianapolis and Kenya.

Dr. Tierney is a member of the Institute of Medicine. He is a Fellow of the American College of Physicians and the American College of Medical Informatics. He is a Founding Fellow of the American Medical Informatics Association and has served on its Board of Directors. He has served as President of the Society of General Internal Medicine. He has been elected to the Association of American Physicians and has served on and chaired numerous national review and advisory boards. He is currently the Co-Editor-in-Chief of the Journal of General Internal Medicine and is past Co-Editor-in-Chief of Medical Care.