Marty Bollinger and Carsten Krebs have a joint research group that focuses on the elucidation of the reaction mechanisms by which mono- and dinuclear non-heme-iron enzymes activate dioxygen (O2) for a wide variety of oxidative transformations, because they have mutual research interest and complementary training and expertise. The Bollinger/Krebs group is part of the Penn State Bioinorganic group.