John Feldmann is an American musician, songwriter, and record producer, best known as the lead vocalist and guitarist of the band Goldfinger. He has been influential in the punk rock and ska music scenes since the 1990s, contributing to the genre's popularity through his energetic performances and catchy melodies. In addition to his work with Goldfinger, Feldmann has produced and written songs for various artists across different genres, including Panic! At The Disco, Good Charlotte, and The Used. His diverse collaborations showcase his versatility and impact on contemporary music.