Bochen Liu came to the University of Rochester with an excellent background in harmonic analysis and hit the ground running. He was an important contributor to the development of the group action formalism for the study of simplexes in subsets of Euclidean space of a given Hausdorff dimension. He later proved the celebtrated Bochen Liu lemma using group actions, the idea that had considerable impact on the study of the Falconer problem in a variety of settings.

After graduating, Bochen did some outstanding work on tiling with Nir Lev in Israel, and then moved on to South China university where continues to make outstanding contributions in harmonic analysis and geometric measure theory. Among my many great memories of Bochen are the ping-pong games we played in the den of my house. I always suspected that Bochen let me win just enough games for me to feel good about my game!