Dr. Robert A. Good, 81, who performed the world's first successful human bone marrow transplant, died Friday of natural causes at his home in St. Petersburg, Fla.
A native of Crosby, Minn., Good decided to become a doctor at age 6 when his father died of cancer. The youth survived his own serious illness, a polio-like disease, during his student years at the University of Minnesota.
When he began his medical career in 1944, he devoted his studies to immunology, including identifying T-cells and B-cells, the main components of the body's immune system.
Working at the University of Minnesota, Good performed the world's first bone marrow transplant in 1968 on a 4-month-old boy. The infant suffered from a genetic immune system disease that had killed 11 male children in his extended family.