Dr. Geisler extensively covers the core topics from the great thinkers of western thought.   

Existentialism, Conventionalism and the problem of evil by studying the philosophies of Plato, Aristotle, Plotinus, Augustine, Aquinas, Spinoza, Hume, Kant, Hegel, Feurbach, Schleiermacher, Kierkegaard, Barth, Buber, Brunner, Husserl, Heiddeger, Ayer, Wittgenstein, Whitehead and Pike. Audio CD's