Research and teaching assistant Drexel University, Philadelphia, 1978-1982. Microbiology consultant American Water Works Service Company, Inc., Haddon Heights, New Jersey, 1980-1982. Trainee in clinical microbiology Children's Hospital of Philadelphia, 1982.
Microbiologist food and pharmaceutical products division Federal Maritime Commission, Newark, Delaware, 1983-1985. Supervisor quality assurance, since 1985. Lecturer in field.