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!