Dr. Arthur Greenberg is a Professor of Chemistry at the University of New Hampshire. His research interests include physical organic chemistry and environmental organic chemistry. Emphases include strained organic molecules such as bridgehead bicyclic lactams, having twisted amide linkages, and epoxyoxepins of possible relevance to benzene metabolism. Interests include airborne carcinogens such as polycyclic aromatic hydrocarbons (PAH) and their derivatives.Dr. Joel Liebman is Professor of Chemistry and Biochemistry at the University of Maryland. His research is interdisicplinary - it overlaps computational/theory, organic chemistry and physical/inorganic chemistry. It is international and it is eclectic - it spans the periodic table as well as the gas and condensed phases. He has investigated the energetics of neutrals and related ions; species stabilized by aromaticity and/or those destabilized by antiaromaticity and strained rings; compounds containing novel functionalities and their energetics. Not merely organic compounds, but also those of the nonmetals and metalloids, he has especially explored species containing fluorine, the noble gases and boron.