This person serves as an Associate Justice of the Supreme Court and wrote a dissenting opinion joined by what other Justice? 
Manuel v. Joliet:  Justice Clarence Thomas wrote a dissenting opinion. Manuel v. Joliet:  Justice Thomas also joined a dissenting opinion by Justice Samuel Alito. Clarence Thomas: Clarence Thomas (born June 23, 1948) is an American judge, lawyer, and government official who currently serves as an Associate Justice of the Supreme Court of the United States.
Justice Samuel Alito