Søren Kierkegaard (1813–1855), the Danish philosopher and theologian, is regarded as a father of modern existentialism. His works include Either/Or, Philosophical Fragments, and Wo...view moreSøren Kierkegaard (1813–1855), the Danish philosopher and theologian, is regarded as a father of modern existentialism. His works include Either/Or, Philosophical Fragments, and Works of Love.view less