Ken Croswell is an astronomer and author. He holds a Ph.D. in astronomy from Harvard. Dr. Croswell is the author of eight books on astronomy for a general audience. He has also had articles published in Astronomy Now, New Scientist, The New York Times, Sky and Telescope, Star Date, and other publications. In addition, he has written for two radio programs, EarthSky and Star Date. For many years he has been the astronomy consultant for Highlights for Children magazine.