Dean Gooderham Acheson (pronounced /ˈætʃᵻsən/; April 11, 1893 – October 12, 1971) was an American statesman and lawyer. As United States Secretary of State in the administration of President Harry S. Truman from 1949 to 1953, he played a central role in defining American foreign policy during the Cold War. Acheson helped design the Marshall Plan and played a central role in the development of the Truman Doctrine and creation of the North Atlantic Treaty Organization.