iation Synthesizer (with E. Fredkin) 1972 First LOGO "turtle" device (with S. Papert) BOOKS Neural Nets and the Brain Model Problem, Ph.D. thesis, Princeton 1954. Computation: Finite and Infinite Machines, Prentice-Hall, 1967. Semantic Information Processing, MIT Press, 1968. Perceptrons, (with Papert), MIT