Dan Van Haften lives in Batavia, Illinois. He has BS, with high honor, and MS degrees in mathematics from Michigan State University, and a Ph.D. in electrical engineering from Stevens Institute of Technology. He began his career with AT&T Bell Laboratories in 1970, and retired from Alcatel-Lucent in 2007. His work involved software development and system testing on telecommunication systems. Co-author of Abraham Lincoln and the Structure of Reason and Barack Obama, Abraham Lincoln, and the Structure of Reason. For more information, see The Structure of Reason.