William Robert Felts Jr., 79, an internal medicine doctor specializing in rheumatology who was a professor emeritus of medicine at George Washington University, died Feb. 12 at his home in McLean. He had heart disease.
  Dr. Felts worked for the university from 1951 to 1993 and was an officer in several medical organizations. Among them, he was president of the American Society of Internal Medicine, the National Capital Medical Foundation and the National Academies of Practice.
  He also was board chairman of the Arthritis Foundation of metropolitan Washington and a consultant to the National Naval Medical Center in Bethesda.
  He was born in Judsonia, Ark. He was a 1944 graduate of the University of Arkansas and a 1945 graduate of its medical school. He served in the Army in the mid-1940s.
  He did his internship at Garfield Memorial Hospital.
  In 1996, he received the American Medical Association's Distinguished Service Award.
  His marriage to Jeanne Felts ended in divorce. His second wife, Lila Dudley Felts, whom he married in 1987, died in 1993.   Survivors include four children from the first marriage, William R. Felts III of Atlanta, Thomas W. Felts of Washington, Samuel Felts of Leesburg and Melissa Felts of Fredericksburg; two stepchildren, Reid Dudley of Washington and Helen Torosian of Fredericksburg; and nine grandchildren.