Clark Glymour is Professor of Philosophy at Carnegie Mellon University. He has been a fellow of the Guggenheim Foundation and of the Center for Advanced Study in the Social Sciences, and a Phi Beta Kappa lecturer. He has consulted for the U. S. National Atmospheric and Space Administration, and for the U.S. National Security Agency His principal scientific work has been on mathematical psychology of learning and on computerized methods for discovering causal relations from non-experimental applications. He has done applied work on forest fire prediction, robotic mineral identification, and, most recently, on neural connectivity.