Barbara RydenBarbara Ryden received her PhD in astrophysical sciences from Princeton University, New Jersey in 1987. After postdocs at the Harvard-Smithsonian Center for Astrophysics and the Canadian Institute for Theoretical Astrophysics, she joined the astronom faculty at the Ohio State University, where she is now a full professor. She has over twenty years of experience in teaching, at levels ranging from introductory undergraduate courses to advanced graduate seminars. She won the Chambliss Astronomical Writing Award for the first edition of Introduction to Cosmology (2002), and is the co-author, with Bradley Peterson, of Foundations of Astrophysics (2010). Read More Read Less