He became board-certified by the American Board of Internal Medicine and then entered private practice as a primary care physician.

He is board-certified by the American Board of Internal Medicine.

He was also a member of the American Board of Internal Medicine, Nephrology panel.

In 1979 he became a Diplomat of the American Board of Internal Medicine.

He is currently the chair of the American Board of Internal Medicine.

In 1981, after three years of training, she was certified by the American Board of Internal Medicine.

He is board certified in rheumatology by the American Board of Internal Medicine.

The following are the subspecialties recognized by the American Board of Internal Medicine.

He is currently a member of the American Board of Internal Medicine and Gastroenterology.

He was certified by the American Board of Internal Medicine in 1993.