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.