 Although Whitehead was Hartshorne’s senior by thirty-six years, the two men began seriously to develop their ideas about God in written form at roughly the same time. In his Harvard doctoral dissertation (1923), Hartshorne argues for the existence of a God that is the eminent exemplification of relational and social values. Whitehead’s writings on the concept of God appear only after 1924, when he moved to America. Between the publication of Science and the Modern World (1925) and Process and Reality (1929)—a time of intense creativity for Whitehead—he articulated his metaphysical system, including the concept of God. During Whitehead’s first year at Harvard, Hartshorne was in Europe for his second year as a Sheldon Traveling Fellow. When he returned to Harvard in 1925 he was given the dual assignment of editing the papers of Charles Sanders Peirce and of serving as Whitehead’s assistant. After 1940 Hartshorne became the primary conduit for Whitehead’s theistic ideas. Indeed, the elaboration and defense of process theism fell largely to Hartshorne and his students at the University of Chicago (1928–1955), Emory University (1955–1962), and the University of Texas at Austin (1962–2000). So great was Hartshorne’s influence that some scholars try to rescue Whitehead from a too Hartshornean interpretation. This fact should serve as a warning that Hartshorne’s version of process theism is not the same as Whitehead’s. We shall see that Hartshorne’s treatment of theism owes much to Whitehead’s metaphysics while departing from it in ways that the Englishman would not accept.