and he is now an emeritus fellow. He has delivered many lectures, including the Henry Sidgwick Memorial Lecture (1989), the first Erasmus Darwin Memorial Lecture (1990), the Michael Faraday Lecture (1991), the T. H. Huxley Memorial Lecture (1992), the Irvine Memorial Lecture (1997), the Tinbergen Lecture (2004), and the Tanner Lectures (2003). In 1991, he gave the Royal Institution Christmas Lectures for Children on Growing Up in the Universe. He also has edited several journals, and has acted as an editorial advisor to the Encarta Encyclopedia and the Encyclopedia of Evolution. He is listed as a senior editor and a columnist of the Council for Secular Humanism's Free Inquiry magazine, and has been a member of the editorial board of Skeptic magazine since its foundation. Dawkins has sat on judging panels for awards as diverse as the Royal Society's Faraday Award and the British Academy Television Awards, and has been president of the Biological Sciences section of the British Association for the Advancement of Science. In 2004, Balliol College, Oxford, instituted the Dawkins Prize, awarded for "outstanding research into the ecology and behaviour of animals whose welfare and survival may be endangered by human activities". In September 2008, he retired from his professorship, announcing plans to "write a book aimed at youngsters in which he will warn them against believing in 'anti-scientific' fairytales." In 2011, Dawkins joined the professoriate of the New College of the Humanities, a private university in London established by A. C. Grayling, which opened in September 2012. Work Evolutionary biology Dawkins is best known for his popularisation of the gene as the principal unit of selection in evolution; this view is most clearly set out in two of his books: The Selfish Gene (1976), in which he notes that "all life evolves by the differential survival of replicating entities". The Extended Phenotype (1982), in which he describes natural selection as "the process whereby replicators out-propagate each other". He introduces to a wider audience the influential concept he presented in 1977, that the phenotypic effects of a gene are not necessarily limited to an organism's body, but can stretch far into the environment, including the bodies of other organisms. Dawkins regarded the extended phenotype as his single most important contribution to evolutionary biology and he considered niche construction to be a special case of extended phenotype. The concept of extended phenotype helps explain evolution, but it does