Who was the priest who brought out Joash and made him king?

Answer: Jehoiada

Jehoiada the priest sent for the commanders and brought out Joash.

“Then in the seventh year, Jehoiada sent for the commanders of hundreds, the Carites, and the guards, and had them brought into the house of the LORD. There he made a covenant with them and put them under oath. He showed them the king’s son”— 2 Kings 11:4 (BSB)