1991-1992: Research Assistant, Department of Biochemistry, University of North Texas (Dr. Robert Gracy) 1992-1994: Research Assistant, Department of Pathology, UCLA (Dr. Rita Effros, Roy Walford) 1994-1997: Graduate Student Researcher, Department of Biochemistry, UCLA (Dr. Joan Valentine, Dr. Edith Gralla) 3/97-10/97: Postdoctoral Fellow, Department of Biochemistry, UCLA (Dr. Joan Valentine, Dr. Edith Gralla) 10/97-9/99: Postdoctoral Fellow, Andrus Gerontology Center, Department of Biological Sciences, USC (Dr. Caleb E. Finch) 09/99-08/01: Research Assistant Professor, Andrus Gerontology Center, School of Gerontology and Dept. of Biological Sciences, USC 09/01-08/06: Assistant Professor, Hanson Chair of Biogerontology, School of Gerontology and Dept. of Biological Sciences, USC 09/06-2011: Associate Professor, Hanson Chair of Biogerontology, School of Gerontology and Dept. of Biological Sciences, USC 02/11-present: Professor and Edna Jones Chair of Biogerontology, School of Gerontology and Dept. of Biological Sciences, USC 07/11-Present: Director, USC Longevity Institute 06/12-Present: Senior Group Leader, IFOM Longevity and Cancer, Milan, Italy