Law clerk, Hon. Robert Braucher, Supreme Judicial Court of Massachusetts, 1976-1977
Private practice, Boston, Massachusetts, 1977-1979, 1981-1982
Staff counsel, U.S. Senate Committee on the Judiciary, 1979-1981
Assistant U.S. attorney, District of Massachusetts, 1982-1986; chief, Civil Division, 1984-1986
Associate justice, Massachusetts Superior Court, 1989-1993
Chair, U.S. Sentencing Commission, 2010-
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U.S. Magistrate, U.S. District Court, District of Massachusetts, 1986-1989