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Our Physicians

Dr. Gwilym Parry and Dr. Tessa Cholmondeley have provided internal medicine (adult primary care) to residents of Reston and the surrounding communities for over 25 years. Their patient-centered approach has always been the hallmark of the care they provide to every patient.

Not willing to compromise the care they provide, Dr. Parry and Dr. Cholmondeley recently decided to transition their practice to concierge medicine which allows them to continue to provide the time and attention every patient wants, needs and deserves. After all, time is the essence of quality – especially when it comes to health care.

Gwilym Parry, MD

Dr. Gwilym Parry has been a fixture in the medical field in Reston, VA for over 30 years. He started his journey with the Reston Medical Group and then began private practice when he formed Medical Associates of Reston in 1987. Dr. Parry is a graduate of the University of Denver where he received his BS degree in psychology. In 1981 he earned his medical degree from the University of Colorado School of Medicine. He completed his internship at Georgetown Medical Service and DC General Hospital. He was the Chief Resident of Internal Medicine at Baystate Medical Center (Tufts University) from 1983-1986. He has been a member of the American Board of Internal Medicine since 1987. Dr. Parry has been awarded several recognition awards including “Top Doctors” by Washingtonian Magazine.

Tessa Cholmondeley, MD

A long-time resident of the Washington Metropolitan area, Dr. Tessa Cholmondeley has been in private practice in Reston, VA since 1991. She graduated at the age of 20 from Oberlin College with a BA in biology and then earned her medical degree, graduating as a “Scholar in Medicine”, from the University of Connecticut. She completed her internship and residency at the George Washington University Hospital, where she was selected to be the Fellow in Internal Medicine for an additional year. Following the completion of her residency, Dr. Cholmondeley began private practice in Reston. She has pursued her first love which is the primary care of adults and teens. She has been Board Certified in Internal Medicine and is a member of the American College of Physicians, the American Medical Association, and the Medical Society of Virginia. Dr. Cholmondeley has undertaken additional training and is a Certified Clinical Densitometrist. She is a recipient of multiple AMA Physician Recognition Awards for her continuing medical education and has been selected by her peers as a Washingtonian Magazine “Top Doctor” on multiple occasions. Dr. Cholmondeley is affiliated with Reston Hospital.

Dr. Cholmondeley is compassionate and empathetic to the needs of her patients and is committed to their comprehensive care. She is skilled in the management of hypertension, diabetes, and obesity. Additionally, Dr. Cholmondeley has extensive experience and knowledge in bone health, cancer screenings, and travel medicine. She is passionate in her proactive approach to preventive health and encourages her patients to lead healthy lives. She establishes collaborative relationships with her patients so they feel comfortable sharing all their concerns with her. Dr. Cholmondeley is excited to continue providing personalized and meaningful care to her patients. She has a keen ability to coordinate care, to help patients understand and make informed decisions in the context of their health concerns. Dr. Cholmondeley is excited to continue providing personalized and meaningful care to her patients in this new format.


24x7 Access

24x7 Direct Physician Access
Via Cell Phone

Priority Scheduling

Same Day Or Next Day Office Visits For Urgent Health Issues

Executive-Level Physicals

Annual review & enhanced analysis of health & wellness


Minimal Waiting & Unhurried Time With Your Personal Physician

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Our Location


1830 Town Center Dr #207,
Reston, VA 20190


Main – 703.435.2227
Fax – 703.435.7856

Reston Medical Associates