Harry Nussbaumer is Professor Emeritus at the Institute of Astronomy, ETH Zurich. Lydia Bieri is Assistant Professor in the Department of Mathematics at Harvard University. Allan Sandage is Astronomer Emeritus at the Observatories of the Carnegie Institution of Washington, Pasadena.
'It's wonderful to have such expert guides. Though their book claims to be for the interested man, it will prove most valuable to Physics Today readers. … Discovering the Expanding Universe is the one you should read.' Physics Today 'Based on a close reading of original papers, this book is a pleasure to read and will be welcomed not only by professional scientists but also by amateurs. The mathematics is conveniently, and fittingly, removed to a masterly appendix.' Nuncius: Journal of the History of Science