National Research Council, to direct the educational work of the United States Bureau of Standards, to lead a wartime scientific mission to France, and to head the executive committee of the National Advisory Committee for Aeronautics (NACA), predecessor to the National Aeronautics and Space Administration (NASA). As a faculty member, Ames was considered an excellent teacher, able to explain complex principles of physics in terms a lay person could understand. Whereas Rowland was known for delivering lectures that prompted more questions than they answered, Ames' lectures displayed a mastery of the subject that was frequently commented on favorably by students and colleagues. Both as a teacher and an administrator Ames supported academic freedom and objected to loyalty oaths then required of teachers in many states. At Hopkins, his gift for administration led to his becoming secretary of the Academic Council in 1915, Dean of the College Faculty in 1924, and Provost in 1926. In 1929, when the University searched for a new president, Ames was appointed. He assumed office July 1, 1929 and commenced an administration which spanned six of the most difficult years in the University's history, due to the economic hardships of the Great Depression. The University's deficit grew as the general financial picture worsened. President Ames managed the University as efficiently as possible, coping with problems such as the "Goodnow Plan" and the new but troubled Institute of Law. He even dealt with the question of commercialism in Hopkins athletics, maintaining that charging admission to athletic events was "improper". Shortly after his retirement on June 30, 1935, gate receipts were abolished. Many years later, this action was reversed and admission charges re-instituted. During his Hopkins presidency, the William H. Welch Medical Library opened on the university's medical campus, and the Walter Hines Page School of International Relations was organized as a division of the university. When the Second World War began, as chair of the Foreign Service Committee of the National Research Council, Ames toured Europe studying scientific developments. Upon his return, he criticized the United States’ isolationist foreign policy, urging that war materials be sent to France as quickly as possible. He also urged that the United States immediately speed up development and production of warplanes. Towards the end of his life, Ames’ work in aviation gained further recognition. In 1935, he was made an honorary fellow of the Institute of Aeronautical Sciences and received from