Jason "Cone" McCaslin (born 3 September 1980) is a Canadian musician, singer, songwriter, and record producer, serving as the bassist and backing vocalist of the band Sum 41. Early life McCaslin began playing bass at the age of 14, as a member of a grunge garage band called Second Opinion. He is of Irish/Swedish descent. He acquired the nickname "Cone" from fellow band member Deryck Whibley in high school, because he frequently ate ice cream cones at lunch. Professional career He co-created the garage punk/garage rock side project The Operation M.D., with Todd Morse (of H2O), in which he goes by the name Dr. Dynamite. He plays bass guitar and other instruments on the songs including lead vocals on a few tracks on both albums. The first album, We Have an Emergency was released in Canada and Japan exclusively in 2007. Operation M.D. then released their second album Birds + Bee Stings worldwide in late 2010 on their own label Mouth To Mouth Music. He has also acted in many Sum 41 short films. For example, in Basketball Butcher, he gets beaten up, killed and eaten by Steve Jocz due to beating him at basketball. He also played Dante the drug dealer in 1-800-Justice. He helped produce an album with Shelter With Thieves, a Canadian band from Halifax, Nova Scotia. The EP, entitled Confessions of a Toxic Generation, was nominated for two Nova Scotia Music Awards, for Group Recording and Loud Recording. The band won the Loud Recording award for the EP. 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. Then in 2010 he began producing three songs for the seven-piece bluegrass/folk/indie band The Strumbellas. In September 2011 he was asked to produce the rest of the album My Father and the Hunter. It was released on February 21, 2012 and received a Juno Award nomination for Best Root/Traditional Album. In October 2013 McCaslin made a cameo playing bass in The Strumbellas music video for "End of an Era". In 2013 McCaslin began working with Toronto band Sun K. and produced their 7" (two songs) which was released and also produced their EP and LP over the following year. In 2014 McCaslin began producing two songs for the band LeBarons which were released in 2015. Sum