My research activities involve modeling and analysis of agricultural and forest ecosystems, including the effects of management practices on sustainability. Selected projects are highlighted below. Work with a multi-disciplinary multi-institutional team to assess the sustainability of biofuel production in the Northeastern and North-Central US. Work with a multi-disciplinary team to assess potential mitigation options for greenhouse gas emissions from the agriculture and forestry sectors. Work with a multi-disciplinary team to model effects of tillage and residue management on soil carbon in the rice-wheat cropping system of the Indo-Gangetic Plains. Work with a multi-disciplinary team to model nitrogen, phosphorus and sediment loading to surface waters in the Upper Susquehanna watershed. Evaluate probabilistic methodologies for assessing risks from fire and invasive species to wildland ecosystems throughout the Western US. Work with a multi-disciplinary team to assess impacts of climate change on maize production and analysis of using various management practices to reduce greenhouse gas emissions from maize systems.