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Sergei Tabachnikov

Sergei Tabachnikov is a professor of mathematics at Penn State University. He works in geometry, topology, and dynamics - one of his favorite topics is mathematical billiards. He also likes to combine theoretical research with computer experiments. He (co)authored several books including "Mathematical Omnibus," a collection of 30 lectures on classic mathematics. Sergei is the Director of the semester-long MASS (Mathematics Advanced Study Semesters) Program at Penn State.