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 would have served as the acting governor except for the one month of July, 2007. Following the 2008 elections, the Republicans won control of the Senate for the first time in state history, with 26 Republicans and 22 Democrats. They selected Glenn Coffee to serve as the first full President "pro tempore" who served from 2009-2011 when he was term-limited out and was selected to serve as Secretary of State in Governor Mary Fallin's administration. Brian Bingman served as President "pro tempore" from 2011 to 2017, and was succeeded by the current President Pro Tempore, Mike Schulz in 2017. The