John R. Moolenaar (born May 8, 1961) represents Michigan's Fourth Congressional District in the U.S. House of Representatives. He is a Republican.Moolenaar is a chemist, and worked at Dow Chemical Company before entering politics. He was elected to the Michigan House of Representatives in 2002, where he served three terms. In 2010, he was elected to the Michigan Senate, where he served one term.