Bessie Dashiell, one of William Coley’s first cancer patients, and her friend and future medical philanthropist John D. Rockefeller Jr. Photo courtesy of the Rockefeller Archives Dr. Coley (1862-1936), center, was an MSK surgeon who developed an early form of immunotherapy used to treat cancer. Photo courtesy of the Cancer Research Institute Dr. Coley was affiliated with MSK from 1893 to his death in 1936. He is now considered the father of cancer immunotherapy. Photo courtesy of the MSK Archives Radiation therapy, shown here being administered by Dr. Coley in 1902, was pioneered at Memorial Hospital. Illustration by Robert Hoke, courtesy of the MSK Archives Bradley Coley (1892-1961), William Coley’s son, succeeded him as head of the bone tumor service at MSK. Photo courtesy of the MSK Archives Lloyd Old (1933-2011), path-blazing MSK cancer immunologist, with William Coley’s daughter, Helen Coley Nauts, founder of the Cancer Research Institute. Photo courtesy of the Cancer Research Institute Jedd Wolchok, cancer immunologist and melanoma expert, holds the Lloyd J. Old Chair for Clinical Investigation at MSK.