J. Reuben Clark Jr. is sustained as the second counselor in the First Presidency. As the first LDS church president since Brigham Young to ask a non-general authority to serve as a Presidency counselor, Heber J. Grant kep the position vacant for sixteen months to allow Clark to complete his service as the Ambassador to Mexico. Clark is the first general authority who has previously served the U.S. government in a high office. He is also the first member of the Presidency with a post-graduate degree (from Columbia) and is ordained a high priest today.
[Source: The Mormon Hierarchy - Extensions of Power by D. Michael Quinn, [New Mormon History database ( http://bit.ly/NMHdatabase )]]