Toshiya Hachisuka is an Associate Professor in the Department of Creative Informatics at the University of Tokyo. He is interested in the intersection of computational statistics, numerical computation, and physics based computer graphics. He has published multiple work on those topics including some recent work on gradient-domain rendering via photon density estimation. He received his Ph.D. in Computer Science from University of California at San Diego in 2011 and B.Eng. from the University of Tokyo in 2006.