1997 – Chair, Department of Pharmacology and Toxicology, University of Louisville
2004–2016; 2018 – Director (Founding), NIEHS Environmental Health Sciences Training Program, University of Louisville
2011 – Director, University of Louisville NCI Cancer Education Program, University of Louisville
2018 – Leader, Superfund Center Research Experiences & Training Coordination Core, University of Louisville
2022–2023 Interim Director Graduate Studies, Department of Pharmacology & Toxicology, University of Louisville
2015 – 2017 Vice Provost for Academic Strategy, University of Louisville
2009 – 2015 Associate Provost for Strategic Planning, University of Louisville
2011 – 2012 Interim Chair, Department of Microbiology and Immunology, University of Louisville
2008 – 2009 Special Assistant to the Provost for Strategic Planning, University of Louisville
2003 – 2009 Leader, Cancer Prevention and Control Program, Brown Cancer Center, University of Louisville
2002 – 2003 Leader, Molecular Epidemiology and Prevention Group, Brown Cancer Center, University of Louisville
1999 – 2003 Interim Director, Center for Genetics and Molecular Medicine, University of Louisville
1989 – 1997 Chair, Department of Pharmacology and Toxicology, University of North Dakota School of Medicine and Health Sciences
1991 – 1997 Director, Graduate Program in Pharmacology and Toxicology, University of North Dakota School of Medicine and Health Sciences
1989 – 1997 Director, Medical Pharmacology I and II courses for Medical Students, University of North Dakota School of Medicine and Health Sciences
1992 – 1994 Director, Biomedical Research Support Program, University of North Dakota School of Medicine and Health Sciences
1985 – 1989 Chair, Department of Pharmacology, Morehouse School of Medicine
1986 – 1989 Director (Founding), Minority Biomedical Research Program, Morehouse School of Medicine
1983 – 1985 Interim Chair, Department of Pharmacology, Morehouse School of Medicine
1997 – Distinguished University Scholar, University of Louisville
2010 – Professor of Medicine (Hematology/Oncology; secondary appointment), University of Louisville School of Medicine
2017 – Member, University of Louisville Superfund Research Center
2018 – Member, Christina L Brown Envirome Institute, University of Louisville
2020 – Member, Center for Integrative Environmental Health Sciences, University of Louisville
1999 – Senior Member, Brown Cancer Center, University of Louisville
1997 – Member, Center for Environmental and Occupational Health Sciences, University of Louisville
2007– 2012 Investigator, Center for Environmental Genomics and Integrative Biology, University of Louisville
2003 – 2009 Investigator, Center for Environmental Cardiology, University of Louisville
1999 – 2016 Member, Birth Defects Center, University of Louisville
1997 – 2018 Member, Center for Genetics and Molecular Medicine, University of Louisville
1997 – 1999 Distinguished Visiting Professor, University of North Dakota School of Medicine and Health Sciences
1993 – 1997 Chester Fritz Distinguished Professor, University of North Dakota School of Medicine and Health Sciences
1989 – 1997 Professor (Tenured), Department of Pharmacology and Toxicology, University of North Dakota School of Medicine and Health Sciences
1989 – 1994 Adjunct Associate Professor, Department of Chemistry, Georgia State University
1989 Professor, Department of Pharmacology, Morehouse School of Medicine
1985 – 1989 Associate Professor, Department of Pharmacology, Morehouse School of Medicine
1986 – 1989 Adjunct Assistant Professor, Department of Pharmacology, Emory University School of Medicine
1983 – 1989 Graduate Faculty, Department of Biology, (Clark)-Atlanta University
1982 – 1985 Assistant Professor, Department of Pharmacology, Morehouse School of Medicine
1980 – 1981 Biology Teacher, Huron Valley Lutheran High School
Visiting Professor, University of Paris Diderot (France)
Visiting Professor, Wenzhou Medical University (China)