John William Feldmann is one of the most famous and successful producers in the pop-punk industry. He has produced and co-written songs accounting for sales of more than 34 million albums worldwide; he has worked with bands such as blink-182, 5 Seconds of Summer, Panic! at the Disco, Good Charlotte, ONE OK ROCK, All Time Low, and many more.
Feldmann is also the lead singer/guitarist of the band Goldfinger.