Alex Eskin (born May 19, 1965) is a Russian American mathematician. He works on rational billiards and geometric group theory. For his contribution to joint work with David Fisher and Kevin Whyte establishing the quasi-isometric rigidity of sol, he was awarded the 2007 Clay Research Award.[1]
Eskin earned his doctorate from Princeton University in 1993, under supervision of Peter Sarnak. He has been a professor at University of Chicago since 1999.