[14] Trohman then met Patrick Stump in a Borders bookstore, and recruited him to join the band, which was subsequently named Fall Out Boy.

Patrick Stump embarked on a solo career and Pete Wentz created the DJ duo Black Cards.

Trohman and his Fall Out Boy bandmate Andy Hurley started a new band, the Damned Things, with Anthrax members Scott Ian and Rob Caggiano and Every Time I Die vocalist Keith Buckley and bassist Josh Newton.

Afterwards, Trohman began work on a new band with Newton and Rob Smith, With Knives, releasing their debut EP, Schadenfreude on April 17, 2012.

[18] In October 2013, they released an EP titled PAX AM Days, which was an homage to the classic punk music the band grew up on.

[20] The album's second single, Uma Thurman, was released to mainstream radio on April 14, 2015, and peaked at 22 on the Billboard Hot 100, and was certified Double-Platinum.

[21] The third single from American Beauty/American Psycho, Irresistible, also landed on the Billboard Hot 100 and peaked at number 48, while also later being certified platinum in the US.

On October 30, 2015, Fall Out Boy released an album of remixes titled Make America Psycho Again, featuring artists such as Wiz Khalifa, Azealia Banks, and Migos.

In April 2017, Fall Out Boy released Young and Menace, the lead single for their seventh studio album, Mania.

[22] The original release date for Mania was set in September 2017, but was pushed back in August of that same year due to the fact that, according to a tweet from lead singer Patrick Stump, "The album just really [wasn't] ready, and it felt very rushed".

This tour included a date at Wrigley Field in the band's hometown of Chicago, marking a milestone in their career as their first headline show at a stadium.

[25] On August 23, 2018, Fall Out Boy surprise-released their third EP, Lake Effect Kid, which the band describes as their "love letter" to their hometown of Chicago.

We should break up.”[40] Trohman has always been open about his struggles with his mental health, specifically how he has dealt with his depression, OCD, and Impostor syndrome throughout his life.

On March 10, 2021, Trohman announced his podcast I Hate Myself,[41] in partnership with Heavy Metal Magazine and Seth Green.

In March 2022, the first issue of The Axe, a comic written by Trohman and Brian Posehn and illustrated by Scott Koblish, was released in Heavy Metal Magazine.

The Axe is a horror-comedy story about three teenagers who steal a cursed guitar, opening up a portal to Sheol, an alternate dimension.

Holy Roller about a pro bowler who is forced to quit his dream job and return to his hometown, which he soon discovers has been overrun by Neo-Nazis, leading him to become a trick bowling ball-wielding Jewish superhero.