Year        Position

2002-present 

Editorial Advisory Board, Current Medicinal Chemistry

2002-present 

Editorial Advisory Board, Brazilian Journal of Pharmaceutical Sciences.

2002-present 

Book Review Editor, Current Medicinal Chemistry: Anti-infective Agents.

2001-present 

Director, Laboratory of Applied Drug Design and Synthesis (LADDS)

2000-present 

Interim Chair, Department of Medicinal Chemistry, The University of Mississippi.

1999-present 

Executive Guest Editor, Current Pharamaceutical Design

1998-present 

Expert Analyst, Chemtracts-Organic

1997-present 

Professor, Department of Chemistry, University of Mississippi, University, MS

1997-present 

Professor, Department of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS

1997-present

Research Professor, Research Institute of Pharmaceutical Sciences and National Center for the Development of Natural Products, University of Mississippi, University, MS

1994-1997

Associate Professor, Department of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS; and Research Associate Professor, Research Institute of Pharmaceutical Sciences, University of Mississippi, University, MS

1990-1994

Associate Professor, Department of Chemistry, University of North Dakota, Grand Forks, ND

1983-1990

Director, Steroids and Natural Products Program, Bio-Organic Chemistry Laboratory, Life Sciences Division, SRI International, Menlo Park, CA

1982-1983

Organic Chemist, Bio-Organic Laboratory, Life Sciences Division, SRI International, Menlo Park, CA

1981-1982

Research Associate, Bio-Organic Chemistry Laboratory, Life Sciences Division, SRI International, Menlo Park, CA

1980-1981

Postdoctoral Research Associate, Department of Chemistry, Oregon State University, Corvallis, OR (J. D. White)

1979-1980

Postdoctoral Research Assistant, Department of Chemistry, University of California at San Diego, La Jolla, CA (M. Goodman)

1977-1979

Research Assistant, Department of Chemistry, University of California at Santa Cruz, Santa Cruz, CA (J. E. McMurry)

1976-1977

Head Teaching Assistant, Department of Chemistry, University of California at Santa Cruz, Santa Cruz, CA

1975-1976

Teaching Assistant, Department of Chemistry, University of California at Santa Cruz, Santa Cruz, CA

1973-1974

Undergraduate Research Assistant, Department of Chemistry, Oregon State University, Corvallis, OR (J.D.White)