After The Get Up Kids split up in the summer of 2005, James entered the studio to write and record tracks with New Found Glory for their album Catalyst, later embarking with them on a tour to support the album.

In 2007, he joined My Chemical Romance as their touring keyboardist, becoming an official member albeit for a short period of time in 2012 until the band's split in 2013.

In late 2012, Dewees began collaborating with Get Up Kids bandmate Matt Pryor on a series of demos.
The collaboration grew into several east-coast tours in early 2013, and a 'Matt Pryor and James Dewees' EP in October 2013.
He also formed digital hardcore act, Death Spells, alongside Frank Iero.
The duo began touring and released their debut single "Where Are My Fucking Pills?"
and an accompanying music video.
Death Spells released full-length album 'Nothing Above, Nothing Below' in 2016.

In 2014, Reggie and the Full Effect went on a spring US headline tour then followed it up by supporting Say Anything and Saves The Day on their end of the year anniversary tour, choosing to perform Under the Tray in full.
Dewees also contributed to Gerard Way's debut album Hesitant Alien, and began touring alongside Way as the keyboardist of his backing band, The Hormones.
After The Get Up Kids split up in the summer of 2005, James entered the studio to write and record tracks with New Found Glory for their album Catalyst, later embarking with them on a tour to support the album.
In 2007, he joined My Chemical Romance as their touring keyboardist, becoming an official member albeit for a short period of time in 2012 until the band's split in 2013.
In late 2012, Dewees began collaborating with Get Up Kids bandmate Matt Pryor on a series of demos. The collaboration grew into several east-coast tours in early 2013, and a 'Matt Pryor and James Dewees' EP in October 2013. He also formed digital hardcore act, Death Spells, alongside Frank Iero. The duo began touring and released their debut single "Where Are My Fucking Pills?" and an accompanying music video. Death Spells released full-length album 'Nothing Above, Nothing Below' in 2016.
In 2014, Reggie and the Full Effect went on a spring US headline tour then followed it up by supporting Say Anything and Saves The Day on their end of the year anniversary tour, choosing to perform Under the Tray in full. Dewees also contributed to Gerard Way's debut album Hesitant Alien, and began touring alongside Way as the keyboardist of his backing band, The Hormones.
James Dewees