at Children's Hospital of Los Angeles. He is board certified in Surgery, Pediatric Surgery, and Critical Care. In January 1978, Harrison accepted a faculty position at UCSF.

Harrison is most famous for his work in fetal surgery and other forms of fetal intervention. In 1980, he and his research colleagues developed the techniques for open fetal surgery using animal models. Then in 1981, Harrison conducted the first open fetal surgery on a fetus to correct