2003 - Present
Deputy Director, Center for Applied Stuides of the Environment , New York, NY

2002 - Present
President, Environmental Studies International, LLC., New York, NY

2000 - Present
President, International Environmental Research Foundation, New York, NY

1995 - Present
Member, Doctoral Faculty in Earth and Environmental Sciences, The Graduate School and University Center, The City University of New York, NY.

1989 - 2003
Associate Director, Environmental Sciences Laboratory Brooklyn College, Brookyn, NY

1994 -1997
Research Associate, Applied Sciences Institute, The Graduate School and University Center, The City University of New York, New York, NY.

1993 - Present
Member, Center for Applied Studies of the Environment, The Graduate School and University Center, The City University of New York, New York, NY.

1992 - Present
Member, Doctoral Faculty in Chemistry, The Graduate School and University Center, The City University of New York, New York, NY.

1988 - 1996
Assistant Professor, Department of Chemistry, Brooklyn College, Brooklyn, NY.

1986 - Present
Visiting Scientist, American Museum of Natural History, New York, NY.

1987 - 1988
Instructor, Center for Polypeptide and Membrane Research, Mount Sinai School of Medicine, New York, NY.

1986 - 1988
Fellow, Stony Wold-Herbert Fund.
Summers-1986,7 Academic Tutor, State College of Optometry, State University of New York, NY.

1986 - 1987
Research Associate, Center for Polypeptide and Membrane Research, Mount Sinai School of Medicine, NY.

1984 - 1986
Research Associate, Environmental Sciences Laboratory, Mount Sinai School of Medicine, NY.

Summer-1982
Recitation Instructor, PREP, Columbia College of Physicians and Surgeons, NY.

Fall 1981
Research Assistant, Laboratory of John A. Hamilton, Memorial Sloan-Kettering Cancer Center, NY.

1980 - 1986
Graduate Student, Department of Chemistry, City University of New York, NY.

1979 - 1986
Graduate Student, Environmental Sciences Laboratory, Mount Sinai School of Medicine, NY.

1978 - 1979
Graduate Assistant, University of Georgia, Athens, GA.

1978 - 1979
Graduate Student, Department of Chemistry, University of Georgia, Athens, GA.

Summers-1977, 8,9
Research Assistant, Environmental Sciences Laboratory, Mount Sinai School of Medicine, NY.