Areas of Interest: Seed germination ecology, biogeography, and evolution of seed dormancy and germination

Professor, University of Kentucky, 1999 - present

Visiting Scientist, Swedish University of Agricultural Sciences (Uppsala), August 1997-January 1998

Senior Research Fellow, Austin Peay State University, Clarksville, TN, Center of Excellence for the Study of Field Biology, 1989-2004

Adjunct Professor, University of Kentucky, 1991-1999

Adjunct Associate Professor, University of Kentucky, 1984-1991

Researcher on USDA Grant for Integrated Pest Management, University of Kentucky, 1979-85

Part-time instructor, University of Kentucky, 1970, 1971, 1978, 1979, 1981, 1985, 1986, 1987

Instructor, University of Kentucky, summer 1969

Teaching Assistant, Vanderbilt University, 1965-1966

NSF Undergraduate Research Participant, Florida Southern College, 1962-1964