I am considered to be the creator of Positive Set Theory, done via my 1976 diss at UCLA.
My "day job" is running a software dev firm in Los Angeles rdic.com
However, additional serious activities:
 President, MondayEveningConcerts.org , the oldest and one of the most renowned contemporary music series in the world. Early leadership was Schoenberg and Stravinsky, and the org has been at the level ever since.
[1a] Related to , I became interested in the topic of *How do you model the phenomenon of music ?* The short answer has two partsL [i] Music is too complex to be analyzed/understood with any single approach. The only feasible way to do this is via models, or better yet , multiple models. [ii] I have created one important new model myself, kind of a music-critic emulated via AI; but more important, I have surveyed and collect what I think are all of the most important models. There are 11.
 Current project (I am a PhD logician - Philosophy/Logic degree UCLA. And expert in various areas of AI). *If 50 years from now an advanced robot reads Descartes Meditations as if addressed to the robot, what would the robot have to say?* This is a fascinating, very rich topic.