Jack Michael Antonoff (born March 31, 1984) is an American musician, singer and songwriter. He is best known as the lead singer and songwriter of Bleachers, and lead guitarist of the indie rock band fun.. He was previously the lead singer-songwriter of the band Steel Train. Antonoff has been nominated for two Golden Globe Awards and has won three Grammy Awards. Jack also started his own music festival called Shadow of The City which takes place annually in New Jersey. He is also known for a lot of production work across pop music, most notably with Taylor Swift.