Heiko Hecht is Research Fellow at the Man-Vehicle Lab, Massachusetts Institute of Technology.

Robert Schwartz is Professor of Philosophy at the University of Wisconsin-Milwaukee. He is the author of Vision: Variations on Some Berkeleian Themes and other books. He is a coeditor of Looking into Pictures: Reconceiving Pictorial Space (MIT Press, 2003).

Margaret Atherton is Professor of Philosophy at the University of Wisconsin-Milwaukee.