David Knezek is an American politician who represents the 5th District in the Michigan Senate. He is a member of the Democratic Party. Prior to his election in 2014, Knezek served as member of the Michigan House of Representatives from 2013-2014 and as a scout sniper platoon member in the United States Marine Corps, completing two tours of duty in Iraq. He was honorably discharged in 2014, having risen to the rank of Sergeant.