Brown, Stuart; Collinson, Diane; Wilkinson, Robert. (1996). Biographical Dictionary of Twentieth-Century Philosophers. Routledge. ISBN0-415-06043-5 "Lewis is best known for his defense of a dualist view of mind and body in opposition to the more prevalent behaviorist views advocated by Ryle and others. He defended with some success a belief in personal survival against the belief common amongst analytical philosophers that immortality was inconceivable. He acquired a high international reputation, particularly in India and America, where he received and took many invitations to lecture and accept other honors."