Dr. Haller is a professor of medicine at the University of Pennsylvania School of Medicine, Philadelphia. He received his doctor of medicine from the University of Pittsburgh, Pennsylvania, and completed his fellowship in medical oncology at the Georgetown University Hospital, Washington, DC. His research interests include both pancreatic and gastrointestinal oncology. Dr. Haller has written several articles that have been published in journals, including Cancer, Annals of Internal Medicine, American Journal of Clinical Oncology, and The New England Journal of Medicine. He is a member of the American Joint Commission on Cancer and National Institutes of Health.