The media is reporting that President-elect Joe Biden is planning to nominate Judge Merrick Garland, who currently sits on the Court of Appeals for the District of Columbia Circuit, to be his Attorney General.
The linked article above noted that:
Moreover, judges are only occasionally elevated directly to the position. The last was Judge Michael B. Mukasey of Federal District Court, whom George W. Bush appointed to run the Justice Department in 2007.
Are there other past examples of a sitting or former federal judge being appointed into the Cabinet?