Os Guinness is an English author and social critic. Born in China, Os is the great-great-great-grandson of Arthur Guinness, the Dublin brewer. He was a witness to the climax of the Chinese revolution in 1949, and returned to England in 1951, where he received a B.D. (honours) from University of London in 1966 and a D.Phil from Oriel College, Oxford in 1981. His most recent book is Renaissance: The Power of the Gospel However Dark the Times, and he joins Jonathon to discuss how Christians should live in a post-modern, post-Christian culture.