Megan Westerby · CC BY 2.0

Co-founder and lead guitarist of Fall Out Boy, which he started with Pete Wentz in 2001 as a side project out of Chicago's hardcore punk scene before it grew into a band with four number-one albums on the Billboard 200. He also plays lead guitar in the heavy metal supergroup the Damned Things, and helped steer Fall Out Boy through a five-year hiatus and a comeback beginning in 2013 that produced four more full-length albums.