Not to be confused with RPG writer Mike Holmes.
From the Artist Biographies in To Be Or Not To Be:
Mike Holmes is an illustrator and comic creator living in Toronto. He's illustrated Adventure Time, Bravest Warriors and drawn or fully created several graphic novels: Shenanigans (Oni Press, 2007), This American Drive (Invisible, 2009) and True Story (Invisible, 2011). He's also published the art collection Mikenesses (2012).