'This is a very important book that bridges the gap between modern atomic physics and modern astrophysics. It covers all the essential subjects, and is very well written. I think it will be of considerable value to research workers in both broad areas, to professors who wish to teach about the subjects, and to students. I expect that it will be very well received by both communities. I'm happy that Cambridge [University Press] will add this book to its distinguished series of books in physics and astrophysics.' Dimitri Mihalas, G. C. McVittie Professor Emeritus, University of Illinois and Laboratory Fellow, Los Alamos National Laboratory