15. "Aniline trimers with hydroxyl groups" Lehigh Valley ACS at Cedar Crest College, Allentown, PA, 22 Feb 2008.
14. "The derivation of molecular orbitals by group theory" Department of Chemical and Physical Sciences, Cedar Crest College, Allentown, PA, 20 Mar 2006.
13. "Theory and practice of ultraviolet-visible spectroscopy" Science Department, Cabrini College, Radnor, PA, Feb 2005.
12. "The Steady-State Approximation in chemical kinetics: Is it really necessary?" Department of Chemistry, Widener University, Chester, PA, 12 Feb 2004.
11. "The importance of isotopes in analytical chemistry" Department of Chemistry, Benedictine College, Atchison, KS, 9 July 2002.
10. "Corrosion inhibition by aniline trimers" Department of Chemistry, Concordia College, Moorhead, MN, 5 April 2002.
9. "Use of Punnett Squares to rationalize the interpretation of mass spectrometry data" Department of Physical Sciences, Rhode Island College, Providence, RI, 4 March 2002.
8. "Aniline trimers as models for the conducting polymer polyaniline" Department of Chemistry and Physics, Coastal Carolina University, Conway, SC, 12 February 2002.
7. "Structure / Activity relationships in conducting polymers" Department of Chemistry, Midwestern State University, Wichita Falls, TX, 4 February 2002.
6. "Corrosion inhibition by aniline trimers via charge transfer: A DFT approach", National Meeting of the American Chemical Society, Polymer Chemistry Section, Washington, D.C., 20 August 2000.
5. "DFT studies of aniline trimers and the inhibition, by electron transfer, of the corrosion of metal surfaces" School of Science and Health, Philadelphia University, Philadelphia, Pa., 29 February 2000.
4. "The calculation of the rates of electron transfer in N, N'-bis(4'-aminophenyl)-1,4-quinonediimine by Marcus theory", Technical University of Eindhoven, the Netherlands, Department of Chemistry, 1 November 1999.
3. "The electronic/magnetic states of N, N'-bis(4'-aminophenyl)-1,4-quinonediimine and their relationship to corrosion inhibition", Princeton University, Department of Chemistry, Spectroscopy Supergroup, 5 August 1999.
2. "Higher order structure of humic acid" Invited Plenary Speech at First Annual Humic Substances Symposium at Northeastern University, 21 March 1997.
1. "Conformational modeling of a proposed building block of humic acid: searching chirally undefined conformational space" at 8th Meeting of the International Humic Substances Society, Wroclaw, Poland, 12 September 1996.
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