“This new edition of Einstein’s popular presentation of both special and general relativity is a joy to read. Over the past hundred years, relativity has been brought to the public in many forms-magazines, books, documentaries-but there’s nothing quite like being guided through one of the most profound scientific insights of all time by the master himself.”-Brian Greene, Columbia University

“This book is not only an important historical document, but displays the style and clarity of Einstein’s thought in a manner accessible to a wide readership. It’s good that it is being reissued in this fine new edition to mark the centenary of his greatest insights.”-Martin Rees, Trinity College, University of Cambridge, and Astronomer Royal

“[Relativity] conjures Einstein as the oracle presenting a theory to the world-one of the most revolutionary and profound theories of all time.”-Pedro Ferreira, Nature

“Nobody is better at explaining relativity than Einstein himself. . . . This 100th anniversary edition is complemented by commentary from Gutfreund and Renn, who clarify some key points and add historical perspective, making Einstein’s own words even more accessible and meaningful.”-Tom Siegfried, Science News

“A reading companion to make Einstein’s thinking clearer to present-day readers.”-Mike Perricone, Symmetry

Hanoch Gutfreund is professor emeritus of theoretical physics at the Hebrew University of Jerusalem, where he is also the academic director of the Albert Einstein Archives. Jürgen Renn is a director at the Max Planck Institute for the History of Science in Berlin. His books include The Genesis of General Relativity.