Meltzer was appointed Principal Deputy Counsel to President
Barack Obama in January 2009, deputy to Counsel
Greg Craig. Meltzer had originally agreed to serve in the position for one year but agreed to stay longer to help in the transition from Craig to
Robert Bauer early in 2010. Returning to Harvard in mid-2010 allowed Meltzer to resume his faculty position within the preferred two-year leave tenure. At the time of his resignation, his service for the administration was noted for efforts to close the military prison at
Guantanamo Bay, Cuba, related policies affecting
terrorism detainees,
anti-abortion issues in the
health care reform debate, and preparation of
Supreme Court Associate Justice
Sonia Sotomayor in her 2009 confirmation hearings. Also noted was close work during his tenure with the acting leader of the
Office of Legal Counsel,
David J. Barron (also a fellow Harvard law professor), and with
United States Associate Attorney General Thomas J. Perrelli, both in the
Department of Justice. ==Personal life==