Biographical Sketches Librarians of Congress. Luther Harris Evans (1902-1981) Portrait of Luther Harris Evans, June 18, 1945. Manuscript Division, Library of Congress Archibald MacLeish appointed Luther Harris Evans director of the Legislative Reference Service (currently the Congressional Research Service) in 1939 and as Chief Assistant Librarian in 1940. For a time, he was also the director of the Reference Department. While Acting Librarian from December 19,...