Dirac Theory of the Electron According to Spacetime Algebra

A simple and straightforward formulation of the Dirac theory of electron exclusively according to Spacetime algebra (and calculus) is presented. The `Dirac algebra', is expressed in identical compact combination of the commutation and anticommutation relations both for Dirac matrices and the spacetime basis vectors. The formulation restates the theory with a set of 'local observables' and provides both comprehensive and coherent description revealing new insights. The noncollinearity of momentum and velocity, arising from a link between spin and momentum is also discussed. According to this reformulation, spin appears as a dynamical property of electron motion and plays fundamental role in exhibiting the quantum behavior.