Professor Todd measures lead in bone to assess cumulative lead exposure; directs the Insulators' Tissue Bank, an asbestos-related disease research biorepository he developed for the Heat and Frost Insulators & Allied Workers union; and is the Director of the CDC/NIOSH World Trade Center Health Program General Responder Data Center at Mount Sinai that manages WTCHP data for over 50,000 general responders involved in the rescue and recovery effort that followed the attacks on 9/11.