Pengarang: David Helfand

David J. Helfand is the chair of the Department of Astronomy at Columbia University where he has served on the faculty for four decades. He has also been a visiting scientist at the Danish Space Research Institute, the Sackler Distinguished Visiting Astronomer at Cambridge University, and president of the American Astronomical Society. He was a founding tutor and served as president and vice chancellor at Quest University Canada. He has published commentary in Nature, Physics Today, the Globe and Mail, the Washington Post, and the New York Times, among other publications.