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Jenna Zebrowski, JD, MBA
Bilingual JD/MBA with compliance and regulatory experience and real estate (leasing and franchise) expertise
The Supreme Court Justices are appointed. They have a law degree from a prestigious law school and a distinguished legal career before they are appointed. The justices usually are very good attorneys with courtroom experience, then they serve as a judge on a lower court. The US president appoints a potential justice and then they are confirmed by the Senate. It is a life appointment. There are no constitutional requirements, but all the current justices have a legal background.
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To further clarify this point, you don't RUN for Supreme Court justice. You are appointed, which means that the president picks you as a candidate and then asks the Senate to confirm the nomination.