During and after the Depression years, the Academy acquired and merged with several other private schools, including the Livingston School, a highly regarded progressive elementary institution, the Dongan Hall-Arden School, which was located on the present day Todt Hill Campus, and the Willard-Mundorf School. In the 1940s, the Lower and Middle Schools of the Academy moved to Dongan Hall, a Georgian mansion that was formerly the estate of Edward Stettinius, FDR's and Truman's Secretary of State. The Upper School remained at the Wall Street campus.