Before his work at the Justice Department, Apelbaum served as staffer on the House Judiciary Committee for 30 years, the last 20 as Democratic staff director and chief counsel. In that capacity, he helped respond to or lead three presidential impeachments as well as a series of high-profile congressional investigations. He supervised the first-ever House action to enforce a congressional subpoena in federal court and two subsequent House subpoena enforcement actions during the Trump administration.
Apelbaum also led committee staff on a range of legislative efforts regarding social, criminal, and economic justice; civil rights and liberties; and immigration. He was previously an associate at Covington & Burling in Washington, DC.