2007 to present - Professor, Department of Hematology & Hematopoietic Cell Transplantation, City of Hope, Duarte, CA
2007 to 2016 - Chief Medical Officer, City of Hope, Duarte, CA
2000 to 2006 - Distinguished Professor of Medicine, University of Southern California, Los Angeles, CA
1991 to 2006 - Chief, Division of Hematology, USC School of Medicine, Los Angeles, CA
1985 to 1990 - Executive Associate Dean, USC School of Medicine, Los Angeles, CA
1983 to 2006 - Medical Director, USC/Norris Cancer Hospital, Los Angeles, CA
1983 to 1997 - Deputy Clinical Director, USC/Norris Cancer Hospital and Research Institute, Los Angeles, CA