Douglas Rennert, M.D., F.C.C.P.
Dr. Rennert received a Bachelor of Science from Haverford College, PA and was elected to the honor society Phi Beta Kappa. He earned his Doctor of Medicine degree from Columbia University College of Physicians and Surgeons. Dr. Rennert completed his internal medicine residency at St. Lukes Hospital in New York City. He successfully fulfilled his Pulmonary and Critical Care Fellowship at Bellevue Hospital/New York University Medical Center. Dr. Rennert is Board Certified in Internal Medicine, Pulmonary Medicine, Critical Care Medicine and Sleep Medicine. He is a Fellow of the American College of Chest Physicians. He is also a member of the American Thoracic Society, Society of Critical Care Medicine, American Academy of Sleep Medicine, and the Medical Society of Virginia. Currently, he is Director of Respiratory Therapy and Director of Critical Care Medicine at HCA Reston Hospital Center. Dr. Rennert co-founded the Northern Virginia Thoracic and Esophageal Disorders Center at the same institution. U.S. News has named Dr. Rennert as one of America’s Top Pulmonologists. Similarly, Dr. Rennert has been honored by the Washingtonian Magazine, Washington Consumer’s Checkbook, and Northern Virginia Magazine as a Top Doctor. Dr. Rennert is happily married and has three wonderful children.
Vas Devan, M.D., F.A.C.P., F.C.C.P.
Dr. Devan attended the University of Delhi in India for undergraduate school as well as medical school. His postgraduate education consisted of an internship at Kingsbrook Jewish Medical Center in New York, a residency at Genesee Hospital at the University of Rochester, and a pulmonary and critical care fellowship at Nassau County Medical Center on Long Island. Dr. Devan was appointed a clinical assistant professor at the State University of New York in Stony Brook through 1993. He is a Fellow of both the American College of Chest Physicians as well as the American College of Physicians. Dr. Devan is a member of the American Thoracic Society, American Academy of Sleep Medicine, and the Virginia Medical Society. He is board certified in Internal Medicine, Pulmonary Medicine, Critical Care Medicine, and Sleep Medicine. Dr. Devan has held directorships in Respiratory Therapy and in Critical Care Medicine in several hospitals in New York and Virginia. Dr. Devan has been honored by the Washingtonian Magazine, Washington Consumer’s Checkbook and Northern Virginia Magazine as a top doctor. He served on the Board of Trustees at Reston Hospital, Reston, Virginia for six years. Dr. Devan is an avid horseman and frequently volunteers as the physician in residence at local equestrian events.
Jahan Naghshin, M.D., M.Sc., F.C.C.P.
Dr. Naghshin attended medical school at Isfahan University of Medical Sciences in Iran. He completed a Masters Degree in Pulmonary Medicine at the University of British Columbia in Vancouver, Canada. Subsequently, Dr. Naghshin finished an Internal Medicine internship and residency at Temple University Hospital in Philadelphia, PA. He then completed a Pulmonary and Critical Care fellowship at the University of Pittsburgh Medical Center (UPMC) in Pittsburgh PA and then an additional Sleep Medicine fellowship at the same University. He has first authored multiple peer-reviewed publications, a chapter in Sleep Medicine Clinic, and has given multiple presentations at both American Thoracic Society (ATS) and Sleep (APSS) conferences.
Dr. Naghshin is quadruple board certified in Internal Medicine, Pulmonary Medicine, Sleep Medicine, and Critical Care Medicine. Dr. Naghshin is a Fellow of the American College of Chest Physicians and holds active memberships in the American Thoracic Society, the American Academy of Sleep Medicine, and the Virginia Medical Society. He is the current director of Pulmonary Rehabilitation Program at Inova Loudoun Hospital. Dr. Naghshin has been honored by the Washingtonian Magazine, and Northern Virginia Magazine as a Top Doctor in 2018.
Dr. Naghshin has a special interest in treatment of patients with severe Asthma, COPD, interstitial lung diseases, lung tumors/cancers, as well as complicated cases of Sleep Apnea.
Dr. Naghshin is fluent in both English and Farsi. He is happily married and has a son.
Payam Pooyan, M.D., F.C.C.P.
Dr. Pooyan attended medical school at Zanjan University of Medical Sciences in Iran. He finished an internal medicine residency at East Tennessee State University in Johnson City, TN. Dr. Pooyan then completed a Pulmonary , Critical Care and Sleep Medicine fellowship at the University of Alabama in Birmingham, Al. Dr. Pooyan is board certified in Internal Medicine, Pulmonary Medicine, Sleep Medicine, Critical Care Medicine and also Palliative Care and Hospice Medicine. He is a Fellow of the American College of Chest Physicians and holds memberships in the American Academy of Sleep Medicine, American Thoracic Society and the Virginia Medical Society. He is married and has a son.
Christie Barnett, M.S., PA-C
Christie Barnett received her B.S. in Medical Technology at the University of Delaware. She completed her Master’s Degree in Physician Assistant Studies at the Philadelphia College of Osteopathic Medicine in Pennsylvania and is board certified. After training, she worked as Lead Critical Care Physician Assistant at Christiana Hospital in Delaware for 8 years. While there she was instrumental in growing the Physician Assistant program, helped develop the procedure training program for both PAs and residents and received her Lean Six Sigma certification. She now works primarily at Reston Hospital in the ICU. She is a member of the Society of Critical Care Medicine and the American Academy of Physician Assistants. Christie is happily married with two small children and two beagles.
Jennifer Purdy, APRN, NP-C
Jennifer received her BSN at Shenandoah University and was elected to the nursing honor society, Sigma Theta Tau. She has experience in critical care nursing from the NICU at Fairfax Hospital and the Emergency Department at Loudoun Hospital Center. She completed her Master’s of Science in Nursing, as a Family Nurse Practitioner at Shenandoah University, where she graduated at the top of her class. While at Shenandoah University, she participated in a week long medical mission trip to the Amazon region of Brazil. After training, she worked as a cardiology Nurse Practitioner in Winchester, VA. She is a member of the American Association of Nurse Practitioners. She is married and has two children and two German Shepherds.