Ronald Gene Estes ( ESS-tiss; born July 19, 1956) is an American politician who has been the U.S. representative for Kansas's 4th congressional district since April 2017. A member of the Republican Party, he served as Kansas State Treasurer from 2011 to 2017. A fifth-generation Kansan, Estes studied engineering and business at Tennessee Tech. He began his career as a consultant and executive in various manufacturing and service industries. Estes was elected treasurer of Sedgwick County in 2004 and reelected in 2008. He was elected Kansas State Treasurer in 2010 and reelected in 2014. After U.S. Representative Mike Pompeo resigned to become Director of the Central Intelligence Agency, Estes won the special election for the seat and was sworn in on April 25, 2017. He is the dean of Kansas's House delegation.