Geoffrey G. Diehl is a Republican politician who represents the 7th Plymouth District (Abington, Whitman, and East Bridgewater) in the Massachusetts House of Representatives. He is a member of the Joint Committee on Housing, House Committee on Global Warming and Climate Change and the House Committee on Technology and Intergovernmental Affairs. Representative Diehl is also a member of the House Library Caucus and Regional School Caucus. On November 2, 2010 he upset incumbent Allen McCarthy and was sworn in on January 5, 2011. He claims to have served as Donald Trump's Massachusetts campaign co-chair during the primary preceding the 2016 Presidential Election. Wikipedia