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David O. McKay
David Oman McKay (September 8, 1873 – January 18, 1970) was an American religious leader and educator who served as the ninth president of the Church of Jesus Christ of Latter-day Saints (LDS Church) from 1951 until his death in 1970. Ordained an apostle and member of the Quorum of the Twelve Apostles in 1906, McKay was an active general authority for nearly 64 years, longer than anyone else in LDS Church history. (Eldred G. Smith was a general authority for 66 years, but only served actively for 32 years, prior to being designated as emeritus.)
Source: Wikipedia