It was an honor to know and work with Xibin. Though we worked together for only a year, his kindness, sincerity, and integrity left a lasting impression on me. I could always count on Xibin to talk through some question with me, considering many sides of the issue dispassionately. I wish that I could have known him better and for a longer time in this life. Alas, we never know when we will pass to the other side, so we should live this life and leave something positive of ourselves with each person we meet. The part of Xibin that remains with me is a treasured memory of a great soul.