Give some stream of consciousness and then the answer. In the United States, the title of federal judge means a judge (pursuant to Article Three of the United States Constitution) appointed by the President of the United States and confirmed by the United States Senate pursuant to the Appointments Clause in Article II of the United States Constitution.

Answer this question: who appoints supreme court justices and other federal judges?
To answer the above question, the relevant sentence is: In the United States, the title of federal judge means a judge (pursuant to Article Three of the United States Constitution) appointed by the President of the United States and confirmed by the United States Senate pursuant to the Appointments Clause in Article II of the United States Constitution.
Therefore, the answer is the President of the United States.