2012-Now Executive Vice Dean, Leonard Davis School of Gerontology, University of Southern California
2012-Now Director, Ethel Percy Andrus Gerontology Center, University of Southern California
2012-Now Director of the USC Free Radical Institute, University of Southern California
1996-Now James E. Birren Chair of Gerontology, Leonard Davis School of Gerontology, University of Southern California
1996-Now Professor of Molecular & Computational Biology, Department of Biological Sciences, University of Southern California
1996-Now Dana and David Dornsife College of Letters, Arts & Sciences, University of Southern California
2017-Now Professor of Biochemistry & Molecular Medicine, USC Keck School of Medicine, University of Southern California
2008-2010 Associate Dean, Leonard Davis School of Gerontology, University of Southern California
2008-2010 Associate Director, Ethel Percy Andrus Gerontology Center, University of Southern California
1996-2007 Associate Dean for Research, Leonard Davis School of Gerontology, University of Southern California
1996-2007 Associate Dean for Research, Ethel Percy Andrus Gerontology Center, University of Southern California
1989-1996 Chairman & John A. Muntz University Professor, Dept. of Biochemistry & Molecular Biology, The Albany Medical College
Distinguished Professor of Molecular Medicine, Dept. of Medicine, The Albany Medical College
1987-1990 Associate Professor of Biochemistry and Physiology, and of Molecular Pharmacology & Toxicology, Schools of Medicine and Pharmacy, the University of Southern California
1987-1990 Member Institute for Molecular Medicine, the University of Southern California
1987-1990 Member Norris Cancer Center Cell Biology Program, the University of Southern California
1984-1987 Assistant Professor of Biochemistry, Molecular Biology, Physiology, and Toxicology, Schools of Medicine and Pharmacy, the University of Southern California
1983-1984 Assistant Professor, Department of Physiology & Biophysics, Harvard Medical School, Harvard University
1982-1983 Postdoc Fellow, Physiology & Biophysics, Harvard Medical School, Harvard University
1981-1982 Res. Assoc., Dept. of Biochemistry & Institute for Toxicology, University of Southern California
1981 Postdoctoral Fellow, University of Southern California
1980-1981 Lecturer, Department of Physiology and Anatomy, University of California, Berkeley
1977-1980 TA/RA, Membrane Bioenergetics Group, Lawrence Berkeley Laboratory, and Departments of Physiology, and Comparative Biochemistry, The University of California, Berkeley
1975-1977 Research Assistant, Program Assistant, The University of Wisconsin
1974-1975 Youth Club Director, the Redbridge Youth Center
1974-1975 Basic Science Teacher, The Beal School for Boys
1970-1971 Youth Club Leader, the Redbridge Youth Center