David Philip Simpson is a departing Republican member of the Texas House of Representatives for District 7, based in Gregg and Upshur counties. In 2010, he unseated the incumbent, Tommy Merritt of Longview, in the Republican primary with 52.88 percent of the vote and then prevailed in the general election for the 82nd Texas Legislature on November 2, 2010 with 91.28 percent of the vote, having had no Democrat opponent.
Simpson was born in Lubbock in West Texas. He was the mayor of Avinger in Cass County from 1993 to 1998 before he relocated in 2000 to Longview, the seat of government of Gregg County. He and his wife, Susan, have seven children. Simpson is a Christian and has published a Statement of Faith. He has been described as someone who did exactly what he said he would do in his campaign and stood for limited government.