Ernst von Glasersfeld (March 8, 1917, Munich – November 12, 2010, Leverett, Franklin County, Massachusetts) was a philosopher, and emeritus professor of psychology at the University of Georgia, research associate at the Scientific Reasoning Research Institute, and adjunct professor in the Department of Psychology at the University of Massachusetts Amherst. He was a member of the board of trustees of the American Society for Cybernetics, from which he received the McCulloch Memorial Award in 1991. He was a member of the scientific board of the Instituto Piaget, Lisbon. Glasersfeld is known for the development of radical constructivism.