This volume reports on lectures delivered by invited physicists from such major laboratories as Santiago de Compostela, CERN, and La Plata. These scientists addressed their younger colleagues on the latest developments in particle physics and quantum field theory. Topics discussed include: duality in field theory and in string theory, testing the Standard Model and beyond, non-perturbative aspects of string theory, conformal field theory, baryogenesis and the electroweak phase transition, and quantum general relativity.