A. Spero, Choice
"Jeroen van Dongen has written a superb account of Einstein's strategy in discovering the general theory of relativity, his attempts at unification of physical forces, and his resistance to the quantum theory."
Howard E. Brandt, Mathematical Reviews
"Jeroen van Dongen's Einstein's Unification is an impressive and important book. Einstein's Unification is a unified, detailed, coherent, and convincing narrative about the path Einstein took after coming to general relativity and the reason for his all-consuming search for a unified theory of the forces of nature. Van Dongen's book will deeply influence how we understand Einstein and how future biographies that try to relate all aspects of Einstein's life will be written."
S. S. Schweber, Isis
"Jeroen van Dongen's remarkable book - an updated and revised version of his Ph.D. thesis of 2002, meanwhile matured through the author's research in the Berlin group and subsequently at the Einstein Papers Project based at CalTech - offers a delightful tour through Einstein's efforts ... constantly analyzed from the dialectics of Einstein's use of (pure) mathematics versus actual physics. The author thereby establishes - and this may be said to be the main point of the book - a gradual shift from the latter (which formed the strength of Einstein's youth) to the former."
N. P. Landsman, The Mathematical Intelligencer