2022-present, Associate Professor, Department of Cancer Biology and Molecular Medicine, Beckman Research Institute of City of Hope, Duarte, CA
2014-2022, Associate Professor, Department of Molecular Medicine, Beckman Research Institute of City of Hope, Duarte, CA
2011-2014, Associate Professor, Department of Radiation Biology, Beckman Research Institute of City of Hope, Duarte, CA
2002-2011, Associate Professor, Division of Hematology and Oncology, Department of Medicine, Indianapolis, IN
2001-2011 Associate Professor Department of Medicine, School of Medicine; Indiana University and Purdue University Indianapolis, Indianapolis, IN
2010-2015, Adjunct Associate Professor, Department of Medicinal Chemistry & Molecular Pharmacology, Purdue University, West Lafayette, IN
2002-2005, Adjunct Associate Professor, Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, Baltimore, MD
2001-present, Invited Professor, School of Medicine, Unversidad Centroccidental “Isandro Alvarado”
1998-2002, Associate Professor, Department of Pharmacology and Experimental Therapeutics, The Greenebaum Cancer Center, and the Programs in Molecular and Cellular Biology, and Toxicology, University of Maryland School of Medicine, Baltimore, MD
1997-2001 Affiliate Scientist, Los Alamos National Laboratory, Los Alamos, NM
1992-1997, Assistant Professor, Pharmaceutical Sciences Department, and the Programs in Molecular and Cellular Biology
1991-1992 Pharmacology and Toxicology, University of Maryland School of Pharmacy, Baltimore, MD
1989-1992, Research Assistant Professor, Pharmacology and Experimental Therapeutics, and the Programs in Molecular and Cellular Biology, Oncology and Toxicology, University of Maryland School of Medicine, Baltimore, MD
1985-1989, Senior Research Associate, Cell Biology Group, Worcester Foundation for Experimental Biology, Shrewsbury, MA
1981-1982, Adjunct Assistant Professor, Marymount College, New York, NY
1980-1984, Postdoctoral Fellow, Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY
1980-1981, Adjunct Assistant Professor, Hunter College of the City University of New York, New York, NY