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Our Physicians

Co-founders Mark Vasiliadis, M.D. and Kevin Kelleher, M.D. are experienced Board-Certified family practitioners who have built superior reputations in the Washington DC community by providing years of exceptional family medical care to their patients, many of whom are local business leaders, politicians and entrepreneurs. In 2016, Dr Dale Matthews joined EHS, moving from a busy primary care practice in McLean. He has served as faculty Yale University, University of Connecticut and Georgetown University, further expanding the skills, experience, and services EHS provides. Dr. Ryan Bosch joined EHS in 2009 after leaving the successful George Washington University Executive Health Program, which he founded.

The EHS physicians all share the common belief that good medicine requires thoughtful attention, unhurried communication and personalized care.

Mark E. Vasiliadis M.D.

Dr. Vasiliadis is a graduate of Langley High School, Virginia Tech and the University of Virginia School of Medicine. He completed his Family Practice residency training at Franklin Square Hospital in Baltimore, Maryland. He is board certified in Family Practice and has been practicing adult and pediatric medicine in the Northern Virginia area since 1994. Since 2003, he was honored by selection to the list of our area's "Best Doctors" by both the Washingtonian and Virginia Business magazines.

Dr. Vasiliadis tutors medical students from Georgetown University Medical School and the George Washington School of medicine, where he is an Assistant Clinical Instructor. He has served on both the Fairfax County Medical Society and the Reston Hospital Medical Care Review committees. He enjoys his role as 'Team Physician' for multiple youth sports programs.

Dr. Vasiliadis married Lynne Epperly from Fairfax, Virginia in 1989. They have two children and reside in Great Falls, Virginia. Dr. Vasiliadis enjoys all sports, especially golf, racquetball and tennis. His special interests include sports medicine, exercise science and pediatrics; however, he enjoys caring for the entire family.

Kevin J. Kelleher, M.D.

Originally from Buffalo, New York, Dr. Kelleher is a board certified Family Physician who has practiced in the Northern Virginia area since 1996. Dr. Kelleher received his Medical Degree from the State University of New York at Buffalo and completed his residency at Franklin Square Hospital in Baltimore where he served as Chief Resident.

Dr. Kelleher is involved in local community and corporate health education through various talks on health related topics. Locally, he works with medical students as an Assistant Clinical Instructor for GWU Department of Medicine, has served on the Reston Hospital Infectious Disease committee and has served as a member of the local county school system's Family Life Education Curriculum Advisory Committee. He has spoken locally and nationally on subjects including migraine management, smoking cessation, and health care reform. He serves as the Medical Director for eDoc4u, an online Health Risk Assessment company, and is the Medical Director of the award-winning Nurse Advocacy Program at SRA International.

He has special interests in Sports Medicine, migraine headache, Adolescent Medicine, smoking cessation and health information technology. His hobbies include the Sciences and American history. He enjoys all sports, especially golf, volleyball and football . He lives in Reston, Virginia with his wife, Karen, and their son, Brayden.

Dr. Kelleher has been ranked by his peers as a Washingtonian Magazine's "Top Doctors", as well as having been selected by Washington Consumer's Checkbook and nationally by the Best Doctors company as a top Primary Care Physician.

Dale A. Matthews, M.D., F.A.C.P.

Dr. Matthews is a board-certified specialist in general internal medicine caring for adult patients. After graduating cum laude from Princeton University, he received his medical degree from Duke University School of Medicine, followed by an internship and residency in internal medicine at the University Of Connecticut School Of Medicine, and a fellowship in internal medicine at Yale University School of Medicine. He has served on the faculty in general internal medicine at three medical schools: Yale University, University of Connecticut, and Georgetown University.

Dr. Matthews has authored books, documentaries, and over 60 peer-reviewed scientific publications largely focused on his research on the doctor-patient relationship and the psychological and spiritual dimensions of medicine. His writings have been featured in numerous national newspapers and magazines including the New York Times Sunday Magazine, Washington Post Magazine, USA Today Weekend, Christian Science Monitor, Newsweek, Reader's Digest, and Prevention and led to numerous national television appearances including the Oprah Winfrey Show, Larry King Live, Good morning America and Fox Evening News.

He has been honored with many teaching and clinical awards through the years, including the Vitals Patients’ Choice Awards yearly from 2008-14, and Most Compassionate Doctor recognition from 2012-2014, and he was named a Washington, DC-Baltimore-Northern Virginia Super Doctor yearly from 2011-13.

Dr. Matthews lives in McLean, VA with his wife Demetra, a certified public accountant. He has two adult children. He enjoys family and church activities, Bible study and teaching, golf, baseball, piano, singing, ballroom dancing, travel and photography.

Ryan G. Bosch M.D., FACP, MBA (Closed Patient Panel)

Dr. Bosch graduated from the University of Virginia as an Echols scholar. He completed his medical school training at the top of his class at UVA on a full U.S. Air Force scholarship. After completing a residency in internal medicine and a fellowship in aerospace medicine in the USAF, Dr. Bosch served in the Air Force as a highly decorated physician officer, and ultimately became the Chief of Flight Medicine at the Pentagon. In this capacity, Dr. Bosch was the personal physician to the Secretary of Defense, Chairman of the Joint Chiefs of Staff, and Secretary of the Air Force. Upon separating from the USAF, Dr. Bosch joined the George Washington University (GWU) MFA academic practice and took on the leadership of their 30 physician internal medicine division. As Director of General Medicine, Dr. Bosch founded their Executive Health Center, developed their teaching curriculum, and became a physician leader on the White House Medical Team. Dr. Bosch has been the personal physician and health advisor for the Vice President, many cabinet leaders, celebrities, local CEOs, and international dignitaries.

In addition to being board-certified in internal medicine, Dr. Bosch holds an MBA in health care informatics from GWU School of Business. Notable personal accolades include authoring the HIMSS national article of the year in The Journal of Healthcare Information Management for his rapid implementation methodology. For his innovative clinical work in technology, Dr. Bosch was named one of three "Microsoft Clinicians of the Year." Dr. Bosch was also honored locally as a "Best Doctor" by the Washingtonian magazine. Dr. Bosch's current clinical practice panel is closed to his current patients only at this time. Dr. Bosch has special medical interests in preventive care, clinical informatics, sports medicine, and nutrition. He lives in McLean with his wife and two children. Dr. Bosch's favorite past time is coaching his kids sports and playing basketball.

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CALL: 703-230-0347    VISIT: 12040 South Lakes Drive, Suite 204, Reston, Virginia 20191