'Jones has been contributing to cosmology since the 1970s, when it was a small data-starved science. In Precision Cosmology he traces the development to the many lines of theory and observation that now fit together so well in the established cosmology. The book progresses from conceptual to increasingly formal, making it accessible to a broad range of readers. They will find a steady supply of references on how to work out all the details, citations to literature that go beyond the standard ones, to interesting and sometimes surprising connections that better inform understanding of how cosmology grew. This is a useful book for teaching and reference.' James Peebles, Princeton University, New Jersey