Professor Ludmil Zikatanov’s work, the “Urschel-Zikatanov Theorem” in spectral graph partitioning[1], was highlighted in a 2016 special article Notices of the American Mathematical Society[2], on a story of John Urschel, a former Penn State student and a professional football player with Baltimore Ravens of the National Football League (NFL) who later turned into a professional mathematician (currently at MIT).
References:
[1] John C. Urschel and Ludmil T. Zikatanov. Spectral bisection of graphs and connectedness. Linear Algebra and Its Applications, 449:1–16, 2014.
[2] Miller, Stephen D. I plan to be a great mathematician: An NFL Offensive Lineman Shows He’s One of Us. Notices of the AMs 63, no. 2 (2016).