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Residents In This Section


Richard I. Rothstein, MD
Chair, Department of Medicine

Richard Rothstein, MD

Richard I. Rothstein, MD is Chair of Medicine and Professor of Medicine and of Surgery at The Geisel School of Medicine at Dartmouth in Hanover, New Hampshire. He is also the Senior Associate Dean for Clinical Affairs at the Geisel School of Medicine.

Dr. Rothstein is a graduate of the Boston University School of Medicine (1980), and did his residency training in Internal Medicine at the University of Massachusetts Medical Center in Worcester, MA (1980-1983). He pursued his fellowship training in Gastroenterology at the Dartmouth-Hitchcock, Hanover, NH (1983-1985) joining the Geisel School of Medicine faculty in 1985.

Dr. Rothstein was Director of Gastroenterological Research and Director of the Gastrointestinal Motility Lab, before becoming GI section chief in 1997.

Dr. Rothstein has a special interest in esophageal function and disease. For over 14 years, he has participated in the research and development of endoscopic therapies for the management of gastroesophageal reflux disease. Dr. Rothstein's other interests include the endoscopic management of Barrett's esophagus , the evaluation and treatment of dysphagia, chemo-interventional trials for prevention of gastrointestinal neoplasia, the endoscopic treatment of obesity, the evolving field of NOTES (natural orifice translumenal endoscopic surgery), and the potential role of robotics in endoscopy.

Dr. Rothstein is a member of the editorial board of Surgical Innovation and a recent associate editor for Gastrointestinal Endoscopy. He actively participates in numerous committees for the American Gastroenterologic Association, American Society of Gastrointestinal Endoscopy and American College of Gastroenterology. He is an ASGE representative to the NOSCAR committee (Natural Orifice Surgical Consortium for Assessment and Research) addressing the future of surgical technologies. He enjoys teaching colleagues, fellows, residents and medical students, and has twice received the Geisel School of Medicine's "Clinical Teacher-of-the-Year" award. He participates actively in national and international educational programs concerning current and future endoscopic technologies. He has been consistently funded in his research efforts for over 27 years and has continuously published papers, chapters and abstracts in his areas of interest.

With his wife Lia, a photographer and art educator, and two children, he has raised cows and sheep and enjoys using his 1948 Farmall C tractor.

Harley P. Friedman, MD
Program Director

Dr. Friedman

Dr. Friedman became Program Director in May 2003 after serving as Associate Program Director / Director of Ambulatory Education since 1998.

He earned his undergraduate degree in biology from McGill University and received his MD in 1994 from the University of Massachusetts.

Dr. Friedman completed his residency training at Beth Israel Hospital in Boston, joining the General Internal Medicine faculty at Dartmouth-Hitchcock in 1997. He has been deeply involved with the residency program along with his rotating patient care duties on the inpatient wards, consult service, and GIM clinic. He is active in the Association of Program Directors in Internal Medicine (APDIM), a national organization dedicated to the improvement of residency education.

Dr. Friedman spends his free time in his woodshop, visiting his children in college, and addressing endless home repair projects. He is fascinated by chaos theory and non-linear dynamics, and he is hopelessly addicted to Duplicate Bridge. He is a huge science fiction / fantasy fan, thinks that the Game of Thrones books are much better than the HBO series, is a big fan of The Expanse, and is always looking for suggestions to read.

Kenton E. Powell, MD
Program Director, Primary Care Track
Associate Program Director

Kenton Powell, MD

Dr. Powell became the PCT Program Director in June, 2012 after serving two years as a faculty member. He became Associate Program Director of the Internal Medicine Residency Program at the same time.

He earned his undergraduate degree in biology at Eureka College in Illinois and received his MD from Dartmouth Medical School.

Dr. Powell completed his internship and residency at Dartmouth-Hitchcock, served as Chief Medical Resident, and stayed on as staff physician in the Section of General Internal Medicine at Lyme where he teaches medical students and residents during community health blocks and longitudinal clinics. He serves on the Internship Selection Committee and was physician lead for NCQA Medical Home Accreditation.

Dr. Powell spends the most of his free time skiing, going to his youngest daughter’s gymnastic events or oldest daughter’s softball games, and going to the gym. He also enjoys motorcycles and is a huge Chicago Blackhawks and Chicago Bears fan.

Hilary F. Ryder, MD
Associate Program Director

Dr. Ryder

Hilary F. Ryder, MD, MS, FACP, FHM is Associate Professor of Medicine, Medical Education and The Dartmouth Institute at The Geisel School of Medicine at Dartmouth in Hanover, New Hampshire. She is also Associate Program Director for the Internal Medicine Residency Program, Clerkship Director of the Internal Medicine third-year clerkship at Geisel, and Director of the Clinical Ethics Consultation Committee for Dartmouth-Hitchcock.

Dr. Ryder earned her undergraduate degree in Sociology from the University of Chicago (BS, 1999). After a brief stint as a geneticist, she received her MD in 2004 from Yale University School of Medicine. She completed her residency training at Dartmouth-Hitchcock (2004-2007) joining the Geisel School of Medicine faculty as a hospitalist in 2007.  She earned a Masters in Science through The Dartmouth Institute in 2012. 

Dr. Ryder has a special interest in medical education research.  She served as Medical Editor for SIMPLE, the most widely used on-line, case-based third-year medical clerkship curriculum.  She is the author of several papers focused on educating patients, providers and lay readers of scientific journals.  Her current work focuses on the meaning and role of assessments in undergraduate and graduate medical education, and understanding moral distress medical students face when encountering ethical dilemmas.

Dr. Ryder also mentors students and residents with interest in medical education research and is most proud of the papers she co-authors with learners.  She is active in the Associate of Program Directors in Internal Medicine (APDIM), and serves on the governing councils of Clerkship Directors of Internal Medicine (CDIM) and the Alliance for Clinical Education (ACE).

She spends her free time with her husband, Matthew, and their four children.  She enjoys hiking with her children, shopping without them, and making peanut butter and jam sandwiches from scratch (baking bread, and picking and canning berries).  She is an avid traveler, having visited more than 30 countries while living in Europe, the UK, Central America, and West, East, Central and South Africa.

Gregory Dadekian, MD, FACP, FACC, MD
Core Clinical Faculty

Dr. Dadekian is a graduate of Holy Cross (B.A., 2002) where he studied Biology and Economics. As a member of the Brown-Dartmouth Program, attended Dartmouth Medical School (2002-2004) and the Warren Alpert School of Medicine at Brown University (M.D., 2006). He received training Internal Medicine at Yale-New Haven Hospital (2006-2009) and then served in the United States Navy at Walter Reed National Military Medical Center (2009-2013), achieving a rank of Lieutenant Commander.

While in the Navy, Dr. Dadekian served as the Director of the Hospital Medicine service at Walter Reed as well as an associate program director for the Internal Medicine residency. He was integrally involved in the daily education of medical students and the Internal Medicine house staff, which sparked his interest in academic medicine, specifically graduate medical education.

Upon completion of his Naval service, Dr. Dadekian returned to the Upper Valley to complete his fellowship in Cardiovascular Medicine (2013-2016) and then joined the faculty at Dartmouth-Hitchcock. As a non-invasive Cardiologist, his clinical focus is in imaging—transthoracic and transesophageal echocardiography, stress testing, and nuclear imaging.

He spends his free time with his wife, Becky, a hospitalist a DHMC and graduate of the Geisel School of Medicine (2006) and their 2 boys, Jackson and Ethan. He enjoys hockey, baseball, a variety of outdoors activities (camping, hiking, cycling), and anything that will tire out his children.

Kelly Kieffer, MD
Vice Chair for Education, Department of Medicine
Resident Clinic Director, Dartmouth-Hitchcock

Kelly Kieffer, MD

Dr. Kieffer is a graduate of the Johns Hopkins University School of Arts and Sciences (B.A., 1990) the University of California, San Francisco School of Medicine (MD, 1995), and The Dartmouth Institute for Health Policy and Clinical Practice (MS, 2011). She completed her residency at Dartmouth-Hitchcock, served as Chief Medical Resident, and then joined the faculty in General Internal Medicine.

She has been the director of the resident clinic at Dartmouth-Hitchcock since 2004 and was the Program Director of the Primary Care Track from 2002 to 2013. She directs the intern outpatient block rotation, co-directs the Formal Instruction of Residents as Educators (FIRE) rotation, and led the Humanism in Medicine conference series from 2005-2013. She enjoys teaching medical students and residents in clinical and didactic settings, and supervising learners conducting quality improvement projects. She became the Vice Chair for Education and Director of the Department of Medicine Morbidity, Mortality, and Improvement Conference in 2015.

Dr. Kieffer spent a year in Rwanda from 2013-2014 with the Human Resources for Health program, teaching students and residents, developing educational curricula, and serving as Associate to the Head of the Department of Medicine. She continues to passionately support a bi-directional exchange of learners and teachers between the Departments of Medicine at Dartmouth-Hitchcock and the University of Rwanda.

In her personal time, Dr. Kieffer enjoys distance running, downhill skiing, gardening, reading fiction, and world travel.

Katherine Devine, MD
Resident Clinic Director, White River Junction VA

Dr. Devine earned her undergraduate degree from Wheaton College in Norton, MA and a Master’s Degree from Tribhuvan University in Kirtipur, Nepal. She received her MD from the Johns Hopkins University School of Medicine and completed her residency training in the Primary Care Track at Dartmouth-Hitchcock.

After several years at Mt. Ascutney Hospital in Windsor, VT, where she precepted residents in the Primary Care Track, she joined the VA in 2013. She now directs the Resident Clinic at the VA.

She enjoys the great outdoors, time in her gardens, reading and fiber arts.


Ellen Eisenberg, MD
Core Faculty, Dartmouth-Hitchcock

Ellen Eisenberg, MD

Dr. Eisenberg is a graduate from SUNY Downstate in 1987, following a career in community mental health nursing. Her residency was in Internal Medicine/Primary Care at then Boston City Hospital. After completing her residency, she went on to do an Infectious Disease specialty at Tufts/New England Medical Center, which she completed in 1992. Following fellowship, she practiced as an ID consultant and primary care clinician for several years during the peak of the aids epidemic. She joined the faculty at Dartmouth-Hitchcock in 2001, has a primary care practice, and is core faculty for the residency program. She directs the Business of Medicine rotation for 3rd year medical residents and co-directs FIRE, the teaching rotation for junior residents.

In her free time she rides and drives her ponies and manages a small horse farm with her husband.

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