In a Unification of Electromagnetism and Gravity, author Selwyn Wright describes his New Relativity (NR) theory in a simple physical way, in order to help the lay person to understand. At the same time he seeks to update aspects of modern physics in a rigorous manner. NR removes confusion in Einstein's relativity, simplifies our understanding of the universe and challenges relativity as a more logical and comprehensive theory. Motional electromagnetic (EM) and gravitational theories are shown to have two inherent deficiencies that have prevented them from becoming a unified theory. Firstly they do not recognize that the propagation medium (ether) is the essential thread that runs through these developments. Secondly they do not realise that EM waves and gravity are two forms of the same field - unsteady electric and steady difference electric fields. Wright's new theory re-establishes a preferred frame of reference and restores the connection between classical and modern physics. It also forges new links between electrical sources and observers in motion and between electric fields and gravity. As explained in the Unification of Electromagnetism and Gravity the medium provides the bridge between the Lorentz transform, accelerating frames and gravity, providing a basis for the unification theory of the universe.