Meet the Doctors
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,
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
Dr. Harvey A Rubenstein M.D.,
Dr. Rubenstein's passion for endocrinology started as a 3rd
year medical student when he did an externship with the internationally
known David H.P. Streeten, M.D. and published a scientific paper
on the effects of epinephrine on renal function. His interest
in endocrinology continued through his internship and medical
residency years at Columbia University in New York City, leading
to research and clinical fellowship training in endocrinology,
metabolism, and diabetes at Columbia-Presbyterian Medical Center.
He worked with the internationally known thyroidologist, Sidney
Werner, M.D., editor of the well known textbook, "The Thyroid."
His published research includes the development of the radioimmunoassay
for the measurement of triiodothyronine (T3) and refinement of
the radioimmunoassy for the measurement of TSH, at the National
Institutes of Health. He has been practicing endocrinology, metabolism,
and diabetes in McLean since 1973 where he has been active in
various community affairs, medical politics, American Diabetes
Association with ultimately becoming president of the Washington,
D.C. chapter, teaching as an Associate Clinical Professor of
Medicine at Georgetown University Medical School, and has appeared
on local and national television. He has received multiple awards
and honors from his undergraduate university, medical school,
the American Diabetes Association, and the American Medical Association,
in addition to being elected to fellowship of the American
College of Physicians and the American College of Endocrinology.
He has published several scientific papers in well-known medical
journals, has been a reviewer of many national endocrine clinical
practice guidelines, and has written the endocrine chapter in
an internationally circulated medical textbook.