pThis 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 B3 field 5 Unification of Quantum Mechanics and Gravitation 6 Antisymmetry 7 Energy from Spacetime and Low Energy Nuclear Reactions 8 ECE Cosmology 9 Relativistic Cosmology and Einstein's Gravitational Waves. The monograph has been translated into Spanish by Alex Hill Spanish language section of www.aias.us. It has already been read tens of thousands of times off www.aias.us and www.upitec.org. Both sites are archived permanently on www.