The material collected in this book originated from the author's twenty-five years of teaching for a two-semester, first year graduate course in the University of Michigan. It discusses the physics and analysis of nuclear and electromagnetic interactions. It also introduces the concepts of Quantum Mechanics from the Liouville, rather than the Schroedinger, point of view. This viewpoint is unique, less abstract and lends itself nicely to physical applications. It is highly recommended as a text for graduate courses in Physics, Chemistry and Engineering.