Dr. Frank R. Crantz, M.D.

Dr Crantz is a native of Detroit, Michigan. He completed his undergraduate degree at the University of Michigan in Ann Arbor. He then spent two years at Cambridge University in Cambridge, England, where he received his Masters Degree. Dr Crantz received his medical degree from Johns Hopkins University School of Medicine in Baltimore, Maryland. He completed his internship and residency in Medicine at The New York Hospital, Cornell University Medical College in New York City. From 1978-1981 he was a Research Fellow in Endocrinology at Harvard Medical School in Boston, Massachusetts. He completed his Endocrine fellowship at the Brigham and Women’s Hospital in Boston. From 1981-1983 Dr Crantz was the Endocrinologist in Charge at Queens Hospital Center and an Assistant Professor of Medicine at SUNY at Stony Brook. He began his endocrine practice in Northern Virginia in 1983 and is one of the founding members of Endocrine Associates. He is a Fellow of the American College of the Physicians and the American College of Endocrinology. He is a Clinical Associate Professor of Medicine at Georgetown University School of Medicine. Dr Crantz is a member of the Endocrine Society, the American Diabetes Association, the American Thyroid Association and the American Association of Clinical Endocrinologists. He is a Past President of the American Diabetes Association, D.C. Area Affiliate. He has done original research in the areas of thyroid disease and Endocrine hypertension.

Dr. S. Mark Tanen, M.D., FRCP(C), FACE, LLC

Dr. Tanen was born in New Haven, Connecticut in 1959. He was raised in Toronto, Canada where he completed his medical training. After a Fellowship at the National Institutes of Health in Bethesda, MD he joined Endocrine Associates in 1989. Dr. Tanen is on staff at INOVA Fairfax Hospital and is a Clinical Assistant Professor at the Georgetown University Faculty of Medicine.

Connect with us

7921 Jones Branch Drive Suite #320 McLean, Virginia 22102

  • 703/ 448-6010

  • 703/ 506-6726


Directions and Parking

From Dulles Toll Road Eastbound

Take VA-267 East / Dulles Toll Rd

Take exit 17 VA-684 South / Spring Hill Road 

Turn right on to Spring Hill Road then immediate left onto Jones Branch Drive

The building is 1 mile on right across from McLean Hilton

From GW Parkway

GW Pkwy north to Route 123 south towards Mclean

After the 495 overpass, turn right onto Tysons Blvd. 

At next traffic light turn slight right onto Galleria Drive

At 2nd light traffic light turn right onto Jones Branch Drive

Third building on left, across from McLean Hilton

From I 495 

If using express lanes take jones branch exit then left jones branch, 2nd building on right Take I495 North or South

Merge onto Exit 46A Chain Bridge Road/VA-123 S towards Tysons Corner

At first traffic traffic turn right onto Tysons Blvd.

At next traffic light turn right onto Galleria Drive

At the second traffic light take a right on to Jones Branch Dr

Third building on left, across from McLean Hilton