Albert Einsteins classic guide to the theory of relativitywith insights from todays leading experts This new edition of "Relativity"the first updated version in over fifty yearsincludes a wealth of original material written by some of todays foremost scientific authorities. Bestselling author and physicist Roger Penrose puts Einsteins work in historical context and details major developments in relativity theory over subsequent years. Relativity expert Robert Geroch provides commentary on key aspects of the special and general theories; and historian David Cassidy explores the profound impact of Einsteins ideas on our culture at large. Now, over ninety years after its first publication, this definitive edition brings a classic text into the new millennium. BACKCOVER: The additions to the original text give considerable insight and are a valuable addition, particularly for anyone approaching the subject for the first time. "Choice" Its as though you are sitting in his classroom, watching [Einstein] alternate between gesticulating and chalking equations onto the blackboard. "The Washington Post Book World"Einstein, Albert is the author of 'Relativity The Special and General Theory', published 2006 under ISBN 9780452287846 and ISBN 0452287847.