Weinhofen formed
metalcore band
I Killed the Prom Queen in
Adelaide in 2000 with drummer JJ Peters. The band released two LPs, one EP, a split EP, a demo and a live CD/DVD before their first split in 2007, with Weinhofen acting as manager from 2004 to 2007. After the departure of vocalist Ed Butcher from
I Killed the Prom Queen, Weinhofen was invited to join American band Bleeding Through after the departure of Scott Danough. He played on their release
Declaration and can be seen in their videos for "Death Anxiety" and "Germany". His new spot in Bleeding Through was one of several factors that caused the split of I Killed the Prom Queen in 2007. They briefly reunited in 2008 for their "Say Goodbye" farewell tour. Weinhofen left Bleeding Through midway through 2009 partly due to homesickness and discontent with living in America. Weinhofen replaced Curtis Ward in British band
Bring Me the Horizon as a permanent member in March 2009. He was featured in the music video for "
The Sadness Will Never End", which was released following the departure of Ward, and recorded with the group on their album ''
There Is a Hell Believe Me I've Seen It. There Is a Heaven Let's Keep It a Secret.'' Weinhofen rejoined I Killed the Prom Queen when the band reunited in 2011 to play on the Destroy The Music Tour. The band also started working on a new studio album. In 2012, Weinhofen had a guest solo spot on
Mors Principium Est's album
...And Death Said Live, on the song "What the Future Holds". In January 2013, Weinhofen left Bring Me the Horizon for undisclosed reasons, which made way for I Killed the Prom Queen to become a full-time band once again. His final album with Bring Me the Horizon,
Sempiternal, was recorded in 2012, but released in April 2013 after his departure. I Killed the Prom Queen released their third studio album
Beloved in 2014 and went on a hiatus in 2017. In September 2021, Weinhofen joined the band
Destroy Rebuild Until God Shows (D.R.U.G.S.). Weinhofen has worked with
Geelong death metal outfit
The Red Shore in an advisory and managerial capacity. The former lead singer and bassist of
The Red Shore, Jamie Hope, has since joined
I Killed the Prom Queen. == Recognition ==