“I believe that the authors have written a first-class book which can be used for a second or third year graduate level course in the subject... Researchers working in the area will certainly use the book as a standard reference....� SIAM Review (Review of the First Edition) “This book is devoted to one of the fastest developing fields in modern control theory---the so-called H-infinity optimal control theory... In the authors opinion the theory is now at a stage where it can easily be incorporated into a second-level graduate course in a control curriculum. It seems that this book justifies this claim.� Mathematical Reviews (Review of the First Edition) “This book is a second edition of this very well-known text on H-infinity theory...This topic is central to modern control and hence this definitive book is highly recommended to anyone who wishes to catch up with this important theoretical development in applied mathematics and control.� Short Book Reviews (Review of the Second Edition)