Charles Hartshorne was an American philosopher who concentrated primarily on the philosophy of religion and metaphysics, but also contributed to ornithology. He developed the neoclassical idea of God and produced a modal proof of the existence of God that was a development of Anselm of Canterbury's ontological argument, which influenced Gödel's ontological proof.

Philosophers speak of God
1953
ISBN 9780226318615
The logic of perfection
1962
ISBN 9780875480374Collected Papers of Charles Sanders Peirce, Volumes V and VI, Pragmatism and Pragmaticism and Scientific Metaphysics
1931

Philosophy and Psychology of Sensation
1934
ISBN 9781625645791
Beyond humanism
1937
ISBN 9780844651163
Creative synthesis and philosophic method
1970
ISBN 9780819129796
Whitehead's philosophy; selected essays, 1935-1970
1972
ISBN 9780803208063
Whitehead's view of reality
1981
ISBN 9780829803815
Omnipotence and other theological mistakes
1984
ISBN 9780873957700
Creativity in American philosophy
1984
ISBN 9780913729106