The seventeenth meeting was held September 15-16, 2006, at Northern Kentucky University. The topic of the meeting was the work and career of Alan Turing. We read two of his most important papers, Computing machinery and intelligence, in Mind (new series), vol. 59, no. 236 (Oct 1950), pp. 433-460, in which Turing presents what is known today as the Turing test for artificial intelligence; and On computable numbers, with an application to the Entscheidungsproblem, Proc. London Math. Soc. (2) 42 (1936), 230-265, in which Turing explores a definition of computability.