Dan Romik is a professor of mathematics at the University of California, Davis. His research interests include combinatorics, number theory, probability theory, asymptotic analysis, and more. His 2016 paper on the moving sofa problem, an unsolved problem in geometry asking what is the largest piece of two-dimensional furniture that can be moved around a corner in an L-shaped hallway, was featured in news articles from media outlets in the UK, US, South Korea, and the Netherlands, and was a subject of a video on the popular online video channel Numberphile. His previous book, The Surprising Mathematics of Longest Increasing Subsequences, was published in 2015.