Unlike its requirement that the President be a "natural born" citizen, and the Senators and Representatives be at least "naturalized," the Constitution is silent on the citizenship and residency requirements for a Supreme Court Justice.
Naturalized citizens are eligible to serve on the Court. In order to become a naturalized citizen, a person must be at least 18 years old and must have been a permanent resident in the United States for at least five years, or for three years, if married to and continuously living with a spouse who's an American citizen. A person voluntarily serving in the US Military is eligible to apply for citizenship after one year of service, or within six month of being honorably discharged.
Non-citizen residents of the United States may or may not be legally eligible for a position on the Court, but politically, the likelihood of a non-citizen being nominated or confirmed by the Senate is virtually nil.
For more information on the Supreme Court justice qualifications, see Related Questions, below.
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Justice Clarence Thomas was the 106th justice to sit on the US Supreme Court.
The proper title is Chief Justice of the United States; however, most people refer to the office as Chief Justice of the Supreme Court because he (or she) presides over the Supreme Court of the United States (often called US Supreme Court).
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Justice Stephen Breyer is currently an Associate Justice on the US Supreme Court. President Bill Clinton appointed Breyer in 1994, to succeed Justice Harry Blackmun, who retired. Breyer is considered one of the progressive members of the Court.