 Hartshorne accepted the task of chronicling process theism’s history and showing its importance as a significant alternative to classical theism, pantheism, atheism, and other lesser known options in philosophical theology. His 1953 anthology (republished in 2000), Philosophers Speak of God, edited with the help of his student William L. Reese, is a massive critical study of the varieties of concepts of God as they relate to process theism. The book includes selections from and commentaries on a wide range of thinkers from Western and Eastern traditions, both well-known and obscure. It is safe to say that Hartshorne’s vigorous efforts on behalf of process theism are the single most important factor in eroding the consensus among philosophers that an eternal, immutable, and impassible deity should be considered normative for philosophical theology. More recently, Daniel Dombrowski has examined the history of the concept of God through the lens of process philosophy (Dombrowski 2016).