 Defenders of the cosmological argument include Swinburne, Richard Taylor, Hugo Meynell, Timothy O’Connor, Bruce Reichenbach, Robert Koons, Alexander Pruss, and William Rowe; prominent opponents include Antony Flew, Michael Martin, Howard Sobel, Graham Oppy, Nicholas Everitt, and J. L Mackie. While Rowe had defended the cosmological argument, his reservations about the principle of sufficient reason prevents his accepting the argument as fully satisfying.