Ao Liu is a Ph.D. student in Computer Science at Rensselaer Polytechnic Institute and is advised by Prof. Lirong Xia. He holds a B.Sc. in Mathematics and Physics from Tsinghua University. His research interest lies in differential privacy, preference learning, and recommender systems. More information can be found on his personal website http://homepages.rpi.edu/~liua6/ .