Ian Casselman (Mr.Fantastic) the drummer for Canadian pop-punk band Marianas Trench, possibly the awesomest person ever.
Me: "I just got a message from Ian Casselman from Marianas Trench on myspace, and I GOT A SIGNED POSTER and it says "IAN=D"."
by xMelissaMarie October 21, 2007
Ian Casselman is the drummer of band Marianas Trench. He is most commonly found on tour with band and in your children's closets.
by Marianas Trench Wench September 2, 2010