Jason "Cone" McCaslin (born 3 September 1980)[1] is a Canadian musician, singer, songwriter, and record producer, serving as the bassist and backing vocalist of the band Sum 41.

McCaslin began playing bass at the age of 14, as a member of a grunge garage band called Second Opinion.

[2] McCaslin attended Exeter High School in Ajax, Ontario along with fellow Sum 41 band members Deryck Whibley, Dave Baksh, and their former drummer Steve Jocz.

(2002), Chuck (2004) Underclass Hero (2007), Screaming Bloody Murder (2011), 13 Voices (2016), Order in Decline (2019), and Heaven :x: Hell (2024).

He plays bass guitar and other instruments on the songs including lead vocals on a few tracks on both albums.

He helped produce an album with Shelter With Thieves, a Canadian band from Halifax, Nova Scotia.

[11] In December 2009, McCaslin was also producing five songs for a new album by Canadian piano rock band The Greatest Invention (Formally – Credible Witness), which eventually got released under Walter Senko.

In October 2013, McCaslin made a cameo playing bass in The Strumbellas music video for "End of an Era".

[citation needed] During the wedding, McCaslin's fellow band members Deryck Whibley of Sum 41 and Todd Morse of H2O and The Operation M.D.