Joseph Mark Trohman (born September 1, 1984) is an American guitarist, singer, and record producer. He is best known as the lead guitarist and backing vocalist of the American rock band Fall Out Boy, as well as the lead and rhythm guitarist for a heavy metal supergroup The Damned Things. Fall Out Boy began as Trohman and Pete Wentz's side project from the hardcore punk scene they were involved with, and the band has scored four number one albums on the US "Billboard" 200, as well as numerous platinum and multi platinum singles in the US and abroad.