Chris Impey is a University Distinguished Professor and Deputy Head of the Department of Astronomy at the University of Arizona, Tucson. His research interests are observational cosmology, gravitational lensing and the evolution and structure of galaxies. He is a past Vice President of the American Astronomical Society, a Fellow of the AAAS and has been NSF Distinguished Teaching Scholar, Phi Beta Kappa Visiting Scholar and the Carnegie Council on Teaching's Arizona Professor of the Year.

Julie McKay is a Los Angeles-based narrator with New York roots, a degree in music, and a background in classical theater. As an actor, she has worked at Shakespeare festivals and regional theaters across the country as well as Off-Broadway in New York.