In the current turmoil over the reality and identity of God, process theology has offered itself as having the most acceptable alternative to ‘classical theism’ and ‘substance philosophy’ with which, it is said, traditional Christianity, both Protestant and Catholic, has aligned itself. As an indirect child of Bergsonian philosophy, though, process theology is not new. And when it is recalled that Bergson not only influenced Whitehead, before the latter exchanged Cambridge for Harvard, but also the leaders of avant-garde Catholicism at the turn of the century, it will be seen that contemporary process theologians have some interesting relatives. Those of Bergson's progeny who have been born through Whitehead and Hartshorne tend to be North American and Protestant; but his other children are European and largely Catholic. The purpose of this essay, then, is to examine the ideas of one of these, George Tyrrell, with the intention of tracing out the similarities that exist between his theology and that advanced by contemporary process theologians. To look for precise coincidence between the positions would be foolish, but to find close parallels would be instructive. It would confirm the view that currently a convergence is taking place between the Protestant avant-garde and its Catholic counterpart, for very frequently the latter is merely reiterating ideas which George Tyrrell had already articulated and for which he was excommunicated in 1908.