This monograph consists of nine chapters which develop the well known Einstein Cartan Evans (ECE and ECE2) unified field theory which has swept the world of science in step with the knowledge revolution. It systematically develops the ECE theory from geometrical first principles and applies it to the unification of gravitation and electrodynamics and the unification of quantum mechanics and general relativity in nine chapters as follows. 1) "Basics of Cartan Geometry"; 2) "Electrodynamics and Gravitation; 3) "ECE Theory and Beltrami Fields"; 4) "Photon Mass and the B(3) field"; 5)...