From the reviews:
Henri Poincaré (1854-1912) is arguably one of the two greatest mathematicians of the late-19th and early-20th centuries. The volume is roughly divided into two parts: the first part is an account of Poincarés life, with particular focus on his professional exploits; the second is a discussion of many aspects of his mathematics. The latter strongly emphasizes differential equations, dynamical systems, and mathematical physics . Summing Up: Recommended. Mathematics and history of science collections serving upper-division undergraduates through faculty. (S. J. Colley, Choice, Vol. 50 (7), March, 2013)
The very readable book conveys a good impression to the reader about Poincarés life and work supported by many illustrations. the book is of special interest for historians of mathematics, mathematicians and mathematical physicists with historical inclinations, but also a reader with a lower mathematical training will gain a colourful insight into the life and personality of a genius. (Karl-Heinz Schlote, zbMATH, Vol. 1272, 2013)
With this book, Verhulst did a marvelous job in sketching not only the person of Henri Poincaré, but also by restricting to the differential equations and dynamical systems, among the diverse subjects that Poincaré worked on, he succeeds very well in communicating the essence of what the theory is about. This is a book obviously interesting for historians of mathematics, but also for any mathematician who want to catch a glimpse of the person and the mind of a genius. (A. Bultheel, The European Mathematical Society, October, 2012)