From 1995 to 2004, she served as respectively Secretary and Chairman of the Registration Committee on Board Certification of Toxicologists. Dr. Enninga sustains active membership in several Societies of Toxicology. She has published in various internationally recognised journals.
In 1990, Dr. Enninga became a board-certified toxicologist. In 1997 she was registered as toxicologist in applied toxicology and officially appointed as education coordinator in toxicology. In 1998, she became Eurotox registered toxicologist. Dr. Enninga graduated in Biochemistry and Molecular Virology (cum laude) in 1981 and concluded her doctors degree from the University of Leiden, The Netherlands in 1986.