Two: Nicolaus Tideman, creator of the Tideman Ranked Pairs voting method, arguably the fairest ranked voting method ever invented (along with the Schulze method, which Kingman uses in its elections). Out of the blue, the president of the Public Choice Society invited me to their annual meeting to present this stuff I posted on the Web years ago. (It's crazy what ranting on the web can do!)
I'm presenting tomorrow afternoon, with a new interactive visualization.
(What's going on in this Flash doohickey requires some explanation, but feel free to play with it if you'd like to try to figure it out yourself, and post your questions or theories here.)