'The book is nicely produced and illustrated ... Certainly one for the library, for historians of science, and for nostalgic old astronomers like me! Younger bloods will also learn some good astronomy from it.' David Stickland, The Observatory Sandage bases his account on nearly a thousand papers published by Mount Wilson astronomers, the National Academy of Sciences Biographical Memoirs series, and his own knowledge of many of the astronomers discussed and their research activities. George E. Webb, Isis