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|Also known as||Pat, Mr. Belvedere|
Codes of Clover
|Guitar, Schecter C-1 Elite, Schecter PT Fastback|
During his career with Seether, Callahan received gold records for the bands successful work on the albums Disclaimer, Disclaimer II, Karma and Effect, The Punisher movie soundtrack, the Daredevil movie soundtrack, and has received a platinum award in Australia for the single, Broken.
Since quitting Seether, Callahan has spent time working with children in a Philadelphia music school called the Music Training Center. He has also played and toured with Metallica, Evanescence, Audioslave, Green Day, Staind, Breaking Benjamin, Slipknot, 3 Doors Down, Shinedown, Def Leppard, and Lionel Ritchie.
In the past, Callahan has made several television appearances (mostly with Seether) which have included MTV, David Letterman, Jay Leno, Carson Daly, Jimmy Kimmel, and Pepsi Smash. He was also featured in the April 2003 issue of Guitar World magazine.
He left the band Seether in 2006.
- White, Sue (12 July 2011). "Seether on the right track as band heads for Mount Pleasant's Soaring Eagle". Bay City Times. Retrieved 5 August 2011.