Robert Alan Good NAM, NAS, AAAS (May 21, 1922 – June 13, 2003) was an American physician who performed the first successful human bone marrow transplant between persons who were not identical twins.

[7] Among his accomplishments, in 1962, he documented the importance of the thymus gland, in 1965 he documented the important role of the tonsils in developing the immune defense systems of mammals including humans, and in 1968 he led the team that performed the first successful human bone marrow transplant between persons who were not identical twins.

[8] The patient who received the transplant was a 5-month-old boy with a profound immune deficiency that had earlier led to the deaths of eleven male members of his extended family.

He remained at Sloan-Kettering until 1982, but his tenure there was marred by the discovery in 1974 of serious scientific fraud perpetrated by William T. Summerlin, a member of his lab who had previously worked with him at Minnesota.

He was survived at the time by Noorbibi K. Day-Good, his second wife, five children from his first marriage to Jean Good, two step-children and 17 grandchildren.