I have served a member of the Science-Policy Committee of American Spciety of Agronomy, Division Chair of the Soil Science Society of America and chair of the international professional organization ( SERA-17) comprised of researchers working to minimize nutrient losses from agriculture.

I serve on the Board of Directors of the American Society of Agronomy and the Book and Multimedia Committee of Crop, Agronomy, and Soil Science Societies of America. I currently serve as Academic Editors of Scientific Reports, PLoS ONE and Water, Section Editor of Current Pollution Reports journals, and have served as Associate Editor of the Journal of Environmental Quality. I serve as a member of the Faculty Research Council of the College of Agricultural and Natural Resources at the University of Maryland. I served as an elected member of the United States Environmental Protection Agency (USEPA) Chesapeake Bay Program Agriculture Workgroup committee. I have been appointed as a representative for the University of Maryland on the State of Maryland Nutrient Management Committee and Phosphorus Management Tool Committee by the Secretary of Agriculture. The overall goal of my research and extension program at the University of Maryland is to conduct basic and applied research and extension to (1) increase understanding of environmental issues as related to agricultural and natural ecosystems and (2) solve environmental problems related to nutrient pollution in the water bodies, including the Chesapeake Bay. After receiving my doctoral degree in Environmental Soil Science from Lincoln University, New Zealand, I was trained as a Postdoctoral Researcher in the Plant and Soil Science department at the University of Delaware and as a Research Scientist in the Biological and Agricultural Engineering department at the University of Arkansas. From 2007 to 2017, I was an Assistant Professor, Associate Professor, and Full Professor in the Department of Soil and Water Sciences at the University of Florida. My expertise is in Nutrient Management, Soil Fertility, and Water Quality. I am a Fellow of the Soil Science Society of America (SSSA).

I am a Professor & Extension Specialist in the Department of Environmental Science & Technology.

Hydrus Network 546 free download