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The Church is led by 15 apostles. The most senior apostle is the president of the Church, and he selects two other apostles as counselors. These three function as the First Presidency, which is the highest governing body of the Church. Twelve others form the Quorum of the Twelve — the second-highest governing body of the Church. Together, the First Presidency and the Twelve oversee the entire Church. Church members trace this organizational structure to the New Testament
The members of the First Presidency are Thomas S Monson, Henry B. Eyring, and Dieter F. Uchtdorf.
Elder Wirthlin was 6th most-senior member of the Quorum of the Twelve.