Envelope is from his office as Secretary of the Treasury and has Iowa Centennial 1938 First Day of Issue stamp and postmark. No content. Henry Morgenthau Jr. (May 11, 1891 – February 6, 1967) was the Secretary of the Treasury during the administration of Franklin D. Roosevelt. He played a major role in designing and financing the New Deal. After 1937, while still in charge of the Treasury, he played the central role in financing US participation in World War II and in shaping foreign policy, especially with respect to Lend Lease, support for China, and helping Jewish refugees.