"This is an excellent textbook and an extremely useful reference. It addresses both simple and complex issues from a modern perspective, while being pedagogical and accessible. The author is an accomplished and famous researcher. Here he shares his deep insights about quantum mechanics in a very powerful and fresh way. Beginning students and senior scientists will benefit from it." —Nathan Seiberg, Professor, Institute for Advanced Study, Princeton, New Jersey"Provides remarkable insights into technical aspects of the subject, but also into the most basic conceptual questions which trouble both new students and more mature researchers" —Michael Dine, Professor of Physics, University of California, Santa Cruz"An excellent book"—Andreas Karch, Professor, University of Washington