When David Marr at MIT moved into computer vision, he generated a lot of excitement, but he hit up against the problem of knowledge representation; he had no good representations for knowledge in his vision systems.
Bio: Harold Waldwin Percival was a philosopher and writer, best known for Thinking and Destiny, in print since 1946. Between 1904 and 1917 he published The Word. In 1950 he founded The Word Foundation, Inc.