David Kenneth Rush was a United States Ambassador who helped negotiate the groundbreaking Four-Power Agreement in 1971 that ended the post-war crisis over Berlin. He also served as Counselor to President Nixon in 1974. He served as Deputy Secretary of State from 1972–1974. Born: January 17, 1910 Died: December 11, 1994 In office: September 3, 1973 – September 22, 1973 Wiki link