Leveldesigner by nature. Rumor has it that he has been a Gamedesigner for his entire life and the one before that. Also, he has probably played all platformers in existence and will play anything that looks like one.
Matt is known for is excessive research and huge dedication to a task. What other people call their free time is research for him, -he always has eyes and ears open for new things and happily presents the to the whole team.
If you want to make sure a game is fun, you should make sure Matt is on board. But he is ours. Too bad for you.