Award-winning teacher and researcher at Vanderbilt University, in Nashville, Tennessee. Author of three books (Is Pluto a Planet?/2006; How Old is the Universe?/2010; Religions and Extraterrestrial Life: How Will We Deal With It?/2014) and many dozens of professional papers.
Professor of Astronomy, Vanderbilt University
Director, Communication of Science & Technology Program, Vanderbilt University
Religions and Extraterrestrial Life: How Will We Deal With It?, Springer-Praxis Books
How Old is the Universe?, Princeton University Press