Barbara Ryden received her Ph.D. in astrophysical sciences from Princeton University. After postdocs at the Harvard-Smithsonian
Center for Astrophysics and the Canadian Institute for Theoretical Astrophysics, she joined the astronomy faculty at The Ohio
State University, where she is now a full professor. She has more than twenty-five years of experience in teaching, at levels
ranging from introductory undergraduate courses to advanced graduate seminars. She won the Chambliss Astronomical Writing
Award for her textbook Introduction to Cosmology (Cambridge, 2016). She is co-author, with Bradley M. Peterson, of one of
the market leading astrophysics texts, Foundations of Astrophysics (Cambridge, 2020). Richard W. Pogge received his Ph.D.
in Astronomy & Astrophysics from the University of California Santa Cruz. Following postdocs at the University of Texas at
Austin and The Ohio State University, he joined the astronomy faculty at OSU where he is a full professor and vice-chair for
instrumentation. His research includes observational spectrophotometry of astrophysics of gaseous nebulae from interstellar
gas to active galactic nuclei using ground- and space-based observatories from radio to X-ray. He has over forty years of
experience teaching both undergraduate and graduate courses.