He left the band in August 2006 due to personal problems. Thankfully he returned in April 2007 and has stayed ever since. During his absence, Matt Williams filled in the bass parts.
He was originally a guitarist, but picked up the bass for the pre-Coheed band Shabutie.
He uses mostly Spector basses, though has recently been favouring Fenders.
Michael plans on releasing a solo album in 2008, which he was working on during his leave. He says that it will be "more folky and more simplistic" than Claudio Sanchez's solo project, The Prize Fighter Inferno. He lists Ani Difranco and Ingrid Michaelson as some of his influences.
Person B: ...
Person A: Are you alright?
Person B: Not at all.