About the Contributor(s): Israel Scheffler is Victor S. Thomas Professor of Education and Philosophy Emeritus at Harvard University. He taught philosophy at Harvard from 1952 to 1992 and, from 1983 to 2003, was codirector, then director of the Philosophy of Education Research Center there. He is a Fellow of the American Academy of Arts and Sciences, a founding member of the National Academy of Education, and a past president of both the Philosophy of Science Association and the Charles S. Peirce Society. Among his previous books are ""The Anatomy of Inquiry""( 1963), ""Four Pragmatists""(1974), ""Of Human Potential""(1985), ""In Praise of the Cognitive Emotions""(1991), and ""Worlds of Truth""(2009). His main interests lie in the philosophical interpretation of language, symbolism, science, and education.