Alan Stuart Armstrong (born July 11, 1962) is an American businessman and politician serving since 2026 as the junior United States senator from Oklahoma. A member of the Republican Party, he was the CEO of the oil and gas company Williams from 2011 to 2025.
Governor Kevin Stitt appointed Armstrong to the Senate after Markwayne Mullin resigned to become secretary of homeland security. Armstrong had never held office before his appointment. Under Oklahoma law, he is ineligible to run for reelection in 2026.
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Early life
Alan Stuart Armstrong was born on July 11, 1962, in McLennan County, Texas. He was raised in Bartlesville, Oklahoma, where he graduated from Sooner High School. Both of his grandfathers, one grandmother, an uncle, and his parents worked for Phillips Petroleum.
