My research program is focused on biogeochemical cycles with an emphasis on forest ecosystems, but also includes work on freshwater. Recent work has included evaluations of the role of nitrogen, sulfur and other major elements in watersheds. This work has included a multidisciplinary approach that includes work with biogeochemistry, hydrology and stable isotopes. All of the projects are collaborative efforts including scientists at the College of Environmental Science and Forestry as well as other institutions including Cornell University, Hokkaido University (Japan), Institute of Ecosystem Studies, Kyoto University (Japan), Oregon State University, Technische Universitat Dresden (Germany), United States Geological Survey, University of Calgary (Canada), University of Maine, University of Waterloo (Canada), University of West Virginia, SUNY-Buffalo, SUNY-Cortland and Syracuse University. My research group is composed of graduate students, technicians and postdoctoral associates. Close cooperation and integration is an important goal in the research efforts of all members of the research team. Field research has included studies at the Huntington Forest in the Adirondack Mountains of New York, Catskill Mountains of New York, Tug Hill Region of New York, Hubbard Brook Experimental Forest in the White Mountains of New Hampshire, Red Canyon Creek in Wyoming, Croton Watershed of New York, Bear Brook Watershed in Maine, Oneida Lake and Lake Erie. I am also involved with doing regional comparisons of biogeochemical processes that most have recently focused on watersheds in the eastern United States, Japan and Europe. I have been a Visiting Professor at Kyoto University in Japan. I have also studied in Germany with support from the Deutscher Akademischer Austausch Dienst (DAAD).