George Terzis is Associate Professor of Philosophy at Saint Louis University. His articles have appeared in such prominent journals as American Philosophical Quarterly, Canadian Journal of Philosophy, Philosophical Psychology, and Philosophical Studies.

Robert Arp is a researcher and analyst for the U.S. Army at Fort Leavenworth, Kansas, who has worked on ontologies for the U.S. Air Force and the National Institutes of Health. He is the author of Scenario Visualization: An Evolutionary Account of Creative Problem Solving.