This collection of essays by scientists from around the world honors Victor Frederick Weisskopf, one of the true luminaries of twentieth- century physics. Among the many breakthroughs his research has yielded have been the theory of the widths of energy levels of the electron, the "Clouded Crystal Ball" model of nuclear structure, and the "MIT Bag" model of hadronic matter. For his contributions to physics, Dr. Weisskopf has been awarded the Max Planck Medal, the J. Robert Oppenheimer Medal, and most recently, the Karl Taylor Compton Award.