Florida International University 1996-present. Adjunct Assistant Professor, Biology Dept. (graduate student advising).

University of Florida 1993-present. Adjunct Assistant Professor, Botany Dept., Plant Pathology Dept. (graduate student advising).

University of South Florida. 1989-1993, 1999-present. Adjunct Assistant Professor, Biology Department. (graduate student advising).

Louisiana State University (1999-present) (graduate student advising).

Butler University. 1987-1988. Adjunct Associate Professor, Biology Department. Introductory Ecology, Natural Resources Management.

Butler University. 1985. Temporary Adjunct Associate Professor. Zoology Department. Natural Resources Management.

University of Wisconsin Botany Dept. and Biocore Program. Teaching Assistant 1976-1980. Introductory Botany for majors, Introductory Botany for non-majors, Biological Diversity, Plants and Man.

S.U.N.Y. Binghamton Biology Dept., Undergraduate Teaching Assistant 1974-1975, Introductory Botany for majors.