Gregory (Greg) Muller

Assistant Professor, University of Michigan

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Roller derby

I am a referee for flat track roller derby, a full-contact sport played on roller skates. Over the last five years, I've officiated more than 100 bouts in 12 states and provinces under the name Dr Math.

Being a derby referee is an awesome counterpart to mathematics. It's physically demanding, a constant challenge, and uses a reactive mindset.

I am affiliated with the Ann Arbor Derby Dimes. From 2010-2013, I was with Red Stick Roller Derby.

If you are interested in staffing me for a bout, email me! References are available upon request.

Here is my officiating history.

Board games

I am a big fan of board games, especially games with deep strategic and strong thematic elements. You can see the games I own here on