Joshua Reuben Clark, Jr. was an American attorney, civil servant, and a prominent leader in The Church of Jesus Christ of Latter-day Saints. Born in Grantsville, Utah Territory, Clark was a prominent attorney in the Department of State, and Under Secretary of State for US president Calvin Coolidge. In 1930 Clark was appointed United States Ambassador to Mexico. He received his BS from the University of Utah where he was valedictorian and student-body president. He received his law degree from Columbia University where he also became a member of Phi Delta Phi, a prominent international legal fraternity in which Clark remained active throughout his life. He later became an associate professor at George Washington University. Both the J. Reuben Clark Law Society and the J. Reuben Clark Law School at Brigham Young University were named in his honor.