| "A Mathematical Analysis of a Three-Candidate Presidential Election," Mathematical Association of America, (1980). | |
| "Music Synthesis on a Microcomputer," Maryland Association for the Educational Use of Computers, (1981). | |
| "Measuring the Effectiveness of a Computer Network," Mathematical Association of America, (1982). | |
| Chairman, Session on Computer Graphics, National Educational Computing Conference, (1983). | |
| "A Computer Learning Algorithm," Mathematical Association of America, (1985). | |
| "The Dempster-Shafer Theory of Evidence," The Johns Hopkins University, (1985). | |
| "Should the Mathematical Association of America Become Involved in Questions of High School and Elementary School Mathematics Education?" Mathematical Association of America, (1985). | |
| "Occurrences of Mathematics in Nature," The Lecture Group, (1985). | |
| "Parsimonious Covering and Spreading Activation in Neural Nets," University of Maryland, (1986). | |
| "The Goucher College Biographical Reference Advisor," Special Libraries Association, (1987). | |
| "Building an Expert System," Eastern Small College Computing Conference (1987). | |
| "Artificial Intelligence Illustrated," Goucher Center for Continuing Studies, (1988). | |
| "DSM III-R: An Expert System for Diagnosis of Schizophrenic Disorders," Department of Psychiatry, University of Maryland School of Medicine, (1988). | |
| "Expert Systems in the Educational Environment," EDUCOM (1988). | |
| "REGIS, A Multi-technological Approach to Intelligent Documentation," Food and Agriculture Organization of the United Nations, (1989); Conference on Artificial Intelligence Research in the Environmental Sciences, (1990). | |
| "Artificial Intelligence and Expert Systems in Communication," Special Libraries Association, (1989). | |
| "The Impact of Artificial Intelligence, Expert Systems, Hypertext and Neural Networks in the Humanities," Goucher College Workshop for Teachers of English, Foreign Language, Social Science and Music, (1989). | |
| "Artificial Intelligence in the Libraries," Military Librarians Workshop, (1990). | |
| "The Origin of Time," Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (1993). | |
| "Surialism," Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (1994). | |
| "History of Mathematics in Jeopardy," Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (1996). | |
| "Mathematics and Sports," (Organizer of Special Session) Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (1998, 2002). (Co-organized in 2002 with Howard Penn) | |
| "Mathematics in Music," Invited Lecture, Bowie State University, (1998). | |
| "Cryptology," Course Director, NSF Chautauqua Program, (Baltimore, MD, Memphis, TN, Bletchley Park, UK) (1998-2005). | |
| "An Analysis of Scoring Algorithms in Professional Boxing," Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (2002). | |
| "Applications of Abstract Algebra," (Co-organizer of Special Session with George Mackiw ) Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (2003). | |
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“Random Walks,” Fourth Annual Kenneth C. Schraut Memorial Lecture, University of Dayton, November 1, 2003. | |
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“Cryptology in Literature,” Invited Address, Loyola College in Maryland, March 24, 2004. | |
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"Cryptology in Literature," Invited Address, Pennsylvania State System of Higher Education - Mathematics Conference, March 18, 2005. | |
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"Classical Cryptology," Four Invited Addresses, Conference on Applied Mathematics, University of Central Oklahoma, June 10 - 11, 2005. | |
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"Cryptology and the Breaking of the Axis Codes during World War II," Bletchley Park, England, August 1 - 4, 2005 and August 2 - 5, 2007. | |
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"Cryptology," (Organizer of Special Session) Joint Meeting of the American Mathematical Society and the Mathematical Association of America, (2008). (Co-organized with Chris Christensen)
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