Mark A. Maddaloni has been employed as an EPA Region II toxicologist since 1991 and is currently on an extended detail to the World Trade Center WTC Response and Recovery Operation.

Prior to his employment at the EPA, Dr. Maddaloni worked as a clinical toxicologist at the New York City Poison Control Center. He currently serves on the New York City Department of Health's Institutional Review Board (IRB). Dr. Maddaloni is a Diplomate of the American Board of Toxicology and a member of the Society of Toxicology.

Dr. Maddaloni received a Dr. P.H. in Environmental Health Sciences from Columbia University, an M.S. in Toxicology from St. John's University and a B.S. in Pharmacy from Long Island University. His doctoral dissertation investigated lead bioavailability through the direct measurement of soil-borne lead absorption in adult human subjects.