Dr. Keith A. Marill, attending physician in the Department of Emergency Medicine at Massachusetts General Hospital, received his M.D. from the University of Rochester School of Medicine and Dentistry. He completed residencies in internal medicine at the University of New Mexico Hospitals, and in emergency medicine at Texas Tech University Health Sciences Center. He received his Masters degree in Clinical Research Design from the University of Pittsburgh.

Dr. Marill is an associate professor at Harvard Medical School. He provides direct supervision and training of residents and HMS students and is a core faculty educator in the Harvard Affiliated Emergency Medicine residency program (HAEMR). Dr. Marill has concentrated on teaching principles of the diagnosis and treatment of acute heart disease in emergency medicine to fellow emergency physicians, researchers, residents, and medical students at local and national conferences and lectures. His translational and clinical research focuses primarily on the prediction, diagnosis, and treatment of sudden cardiac death. Dr. Marill is a leader of the MGH emergency medicine residency journal club.  He also teaches clinical research principles to residents and medical students.  He serves as a decision editor for the journal Annals of Emergency Medicine