content: Very well written. Gives a great feel for who Hilbert was as a person. It also does a good job of placing his achievments amoung the other mathematians of his time. I have attempted reading a few biography's of other mathematicians that focus on the math and not the person. They are almost unreadable. This book does not make this mistake. I have just bought "Foundations of Geometry" because of this book. I highly recommend it. PS - 4 stars is as high a rating as I give. I like having room to move for the truely fantastic.