"To appoint a leader" means to choose or select someone to take on a position of authority, responsibility, and decision-making power within a group or organization. Full definition
Most communities fall apart quite quickly from my experience of them, and it almost always boils down to control issues on the part of the so - called self appointed leaders. (nakedpastor.com)
In June 2003 he was appointed Deputy Leader of the House of Commons under the Government's newly appointed Leader of the Commons, Peter Hain. (en.wikipedia.org)
President Ronald Reagan had come to meet Mikhail Gorbachev, the newly appointed leader of the Soviet Union. (scientificamerican.com)