Craig P. Bauer is an associate professor of mathematics at York College of Pennsylvania and the editor-in-chief of Cryptologia. He was the 2011-2012 Scholar-in-Residence at the National Security Agency (NSA) Center for Cryptologic History, where he wrote several papers for NSA journals, gave numerous lectures, and made substantial progress on a second book focused on unsolved codes and ciphers. He earned a PhD in mathematics at North Carolina State University.