Who is the only justice to have served both as a federal district court and a federal appeals court judge before his elevation to the U.S. Supreme Court?

Question

Who is the only justice to have served both as a federal district court and a federal appeals court judge before his elevation to the U.S. Supreme Court?

Accepted Answer

Charles Evans Whittaker served as a federal district court judge in Missouri from 1954 to 1956 and as a federal appeals court judge (Eighth Circuit) from 1956 to 1957.

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Who is the only justice to have served both as a federal district court and a federal appeals court judge before his elevation to the U.S. Supreme Court?