Edwin Charles Krupp (born November 18, 1944) is an American astronomer, researcher, author, and popularizer of science. He is also known as Ed or E.C. He is an internationally recognized expert in the field of archaeoastronomy, the study of how ancient cultures viewed the sky and how those views affected their cultures. He has taught at the college level, as a planetarium lecturer, and in various documentary films. He has been the director of the Griffith Observatory in Los Angeles since first taking over the position in 1974 after the departure of the previous director, William J. Kaufmann III. His writings include science papers and journal articles, astronomy magazine articles, books on astronomy and archaeoastronomy for adults, and books explaining sky phenomena and astronomy to children. Krupp is a member of the American Astronomical Society and the International Astronomical Union, and has served in several divisions and commissions of both organizations. He is also a fellow of the Committee for Skeptical Inquiry and a member of that organization's Council for Media Integrity.