I received my Ph.D. there in 1977 (on The Evolution of Cluster X-ray Sources) under George Field, first director of the Center for Astrophysics. I left astronomy and theoretical astrophysics for a long and enjoyable career in the high performance computing field after a couple of postdocs. I appreciate what you have done over the decades to keep the Astronomy department and the Harvard-Smithsonian Center at the leading edge, and in fulfillment of George Field's original vision. I look forward to reading Interstellar when it comes out.