“An admirably detailed and engaging book. . . . Cahan deserves great praise for having given us a comprehensive biography that will be of enduring value and the greatest interest for anyone concerned with science and human history.”

Wall Street Journal

"Doesn't leave much out."

New York Review of Books

"A magnum opus."

Deborah R. Coen | Times Literary Supplement

"It is without a doubt a masterpiece."

Helge Kragh | Metascience

"A magisterial biography of one of the last of the great polymaths."

Barbara Kiser | Nature

"To produce a definitive biography of a protean figure like Helmholtz is a major scholarly achievement, and that is what [Cahan] has accomplished. . . . The treatment is richly detailed, judicious, quietly conservative, and eminently readable. . . . Good biographies paint pictures of individual lives, and Cahan does that vividly . . . . To read David Cahan's biography is to be drawn into meditation about the ironies of scientific fame and the varieties of scientific creativity."

R. Steven Turner | H-Net Reviews

"David Cahan has just delivered a book that, based on thirty years of work and on archives only recently made available and dispersed throughout the entire world, should long remain the best and most complete biography of the savant [Hermann von Helmholtz]."

Michel André | Books

"A monumental study that draws together a vast archive of primary sources and scholarship to show the many threads—intellectual, ethical, historical and personal—that cohered in this remarkable nineteenth-century life in science. . . . Cahan’s volume magisterially restores Helmholtz’s rich historical legacy."

German History

"The new standard for all Helmholtz scholars, a comprehensive guide and crucial resource for historians, philosophers or sociologists interested in this scientific luminary."

Henning Schmidgen | Nature

"Cahan has prepared the work of a career, collecting what must be nearly every known detail about the life of the German scientist and intellectual . . . . He seemingly effortlessly weaves together Helmholtz’s family life, education, academic positions, organizational and political involvements, roles in establishing and administrating institutions, and efforts to popularize recent developments in science. . . . Cahan’s use of evidence—which is drawn from a dazzling array of published and manuscript primary sources—is appropriate, sufficient, representative, and faithful. . . . Well worth the time required to read it."

Mathematical Association of America

"Encyclopedic. . . . Cahan's presentation is lucid, patient, and detailed, with frequent backtracks to view material from multiple perspectives. . . . Helmholtz is an excellent, in-depth examination of one of 19th-century Europe’s most influential scientists. . . . Recommended."

CHOICE

"Cahan not only avoids the pitfall of hero worship, but he makes his biography relevant to anyone interested in nineteenth-century science. What impressed me most is how Cahan gives us an insight into the nineteenth-century scientific community through the eyes of Helmholtz and his contemporaries. Time and again we see the importance of maintaining local, national and international networks."

Stadium

“David Cahan has written a masterful biography whose implicit argument is to present Hermann von Helmholtz as a grand unifier. He does this by following the thread of culture that bound together the life, work, and context of his subject. Given the centrifugal tendencies in each of these realms—the ultimate dissolution of a shared German identity, the increasing specialization of scientific research, and the modern fracture of the self, Cahan’s achievement is impressive. By bringing so many disparate sources and topics into coherence, Helmholtz mirrors the very figure it portrays.”

Gabriel Finkelstein, History, University of Colorado Denver

“By far the most in-depth, culturally situated, and well written analysis of Helmholtz to date—no one knows Helmholtz as well or as thoroughly as David Cahan.”

Frederick Gregory, University of Florida

"The first full-length biography of Helmholtz in more than a hundred years. . . . a major contribution to both the history of science and nineteenth-century European history. . ."

Isis

"This book shows the potential impact of biographical representations on modern scientific-historical research. Based on the analysis of extensive and complex scientific work... Cahan presents Helmholtz's scientific achievements in the cultural, social and political contexts of his time. Science and life are thus... presented as part of a reciprocal network of relationships that shows the social and political relevance of modern science."

Physik Journal