evolutionary psychology and philosophy of mind He returned to Cambridge, to the Sub Department of Animal Behaviour in 1970, and there met Dian Fossey, who invited him to spend three months at her gorilla study camp in Rwanda. His experience with the gorillas, and a subsequent visit to Richard Leakey's field-site on Lake Turkana, set Humphrey thinking about how cognitive skills – intelligence and consciousness – could have arisen as an adaption to social life. In 1976 he wrote an essay titled "The Social Function of Intellect", which is widely regarded as one of the foundational works of evolutionary psychology and the basis for Machiavellian intelligence theory. This paper formed the basis of his first book, Consciousness Regained: Chapters in the Development of Mind (1983). In 1984 Humphrey left his academic post at Cambridge to work on his Channel 4 television series The Inner Eye, on the development of the human mind. This series was finished in 1986 with the release of a book of the same name. In 1987, Daniel Dennett invited Humphrey to work with him at his Center for Cognitive Studies at Tufts University. They worked on developing an empirically based theory of consciousness, and undertook a study on Multiple Personality Disorder. Humphrey's next book, A History of the Mind (1992), put forward a theory on how consciousness as feeling rather than thinking may have evolved. This book won the inaugural British Psychological Society's annual Book of the Year Award in 1993. His writings on consciousness continued in The Mind Made Flesh: Essays from the Frontiers of Evolution and Psychology (2002), Seeing Red: A Study in Consciousness (2006), and most recently Soul Dust: the Magic of Consciousness (2011). In this last book he puts forward a radical new theory. Consciousness, he argues, is nothing less than a magical-mystery show that we stage inside our own heads – a show that paves the way for spirituality, and allows us to reap the rewards, and anxieties, of living in what he calls the "soul niche". Other work Humphrey became active in the anti-nuclear movement in the late 1970s. This led to an invitation to deliver the Bronowski lecture on the BBC in 1981. He titled his lecture, on the dangers of the arms race, "Four Minutes to Midnight". With Robert Lifton he edited an anthology of writings on war and peace, In a Dark Time, which was released in