Introduction and some problems encountered in the construction of a relativistic quantum theory.- Relativistic Classical and Quantum Mechanics.- Spin, Statistics and Correlations.- Gauge Fields and Flavor Oscillations.- The Relativistic Action at a Distance Two Body Problem.- Experimental Consequences of Coherence in Time.- Scattering Theory and Resonances.- Some applications: The Electron Anomalous Moment, Invariant Berry Phases and the Spacetime...