PhD saking University of Texas taun 1973, Postdoctoral fellow wonten ing The Scripps Clinic and Research Foundation, La Jolla, California (1971-1974), Investigator nalika Howard Hughes Medical Institute (1997-2012), gayut gelar profésor saking University of Texas MD Anderson Cancer Center, Houston, Texas (2012), guru wonten ing University of Texas System Cancer Center (1977-1984), guru wonten ing University of Barkeley (1985-2004), nyambut damel wonten ing Memorial Sloan- Kettering Cancer Center, New, York (2004-2012), University of Texas MD Anderson Cancer Center, Houston, Texas., Direktur Parker Institute for Cancer Immunotherapy, San Francisco.