Most people will know him by the soundtrack for the movie "That Thing You Do" and the song of the same title.
What you SHOULD know about him (besides this great song) is his music as The Candy Butchers, his collaborations with another fav of mine - Bleu - in bands like LEO and The Major Labels, as well es his solo stuff. I suggest you start with
"Hang On Mike" by "The Candy Butchers":
"Lurch" by "Mike Viola"
Mike Viola - Hair Of The Dog (Live)