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
President pro tempore of the Oklahoma Senate 16, 1907, the same day Oklahoma was admitted U.S. state. He served a single term and was replaced by J. C. Graham in 1909. For its first 60 years, no one person ever held the office for more than one term consecutively. Tom Anglin of Holdenville, Oklahoma, was the first to hold the office a second time, serving from 1923 to 1925 and again from 1943 to 1945. Clem McSpadden was the first president pro tempore to serve two consecutive terms, from 1965 to 1969. From 1965 to 2006, ten state senators have been selected to serve as president pro