Science Advisor to the President War II by President Franklin Delano Roosevelt. Vannevar Bush chaired this office through Roosevelt's death in 1945, and continued under Roosevelt's successor Harry S. Truman until 1951. After the war, President Harry S. Truman replaced the OSRD with the Science Advisory Committee in 1951. The office was moved to the White House on November 21, 1957, by President Dwight D. Eisenhower to provide advice and recommendation in response to the Space Race started by the USSR's launch of the first artificial Earth satellite, Sputnik 1. President Richard M. Nixon eliminated the PSAC in 1973, rather than appointing a replacement for
Secretary-General to the President one of a group of senior state officials, including the outgoing president, the Taoiseach and the chairs of both houses of the Oireachtas, who must be formally notified of the election of a new president by the Returning Officer. The coming into force of the new Irish constitution, in December 1937 resulted in the creation of a new office, President of Ireland. While the office was not scheduled to be filled until mid 1938 its powers, functions and duties were required to be exercised immediately. That role was given to the new collective vice-presidency, which under the transitory provisions of