Elizabeth Baggs is a senior lecturer at the University of Aberdeen, UK. Her research interests are in rhizosphere biogeochemistry, plant-microbe-soil interactions, and linking greenhouse gas production in soils to the underpinning microbiology. She has developed stable isotope approaches for quantifying N2O production from different microbial processes and for examining interactions between soil N and C cycles.

Hermann Bange is a chemical oceanographer in the Marine Biogeochemistry Research Division of the IFM-GEOMAR, Leibniz Institute for Marine Sciences, Kiel, Germany. His research interests include the oceanic emissions and pathways of trace gases such as nitrous oxide and methane. He is also interested in the oceanic nitrogen cycle and the distributions of short-lived intermediates such as hydroxylamine and hydrazine.

Lex Bouwman is a senior researcher at the Netherlands Environmental Assessment Agency (PBL). His main research interests are global modelling of land use and agricultural systems, and environmental problems associated with nutrient cycling in agriculture. During the last few years the focus has been on land-sea interactions through nutrient enrichment.

Klaus Butterbach-Bahl is a head of department at the Institute of Meteorology and Climate Research (IMK-IFU), Karlsruhe Institute of Technology in Garmisch-Partenkirchen, and a professor at the University of Freiburg, Germany. His main research interests are related to measurements and modelling of biosphere-atmosphere exchange processes of environmentally important trace gases at site and regional scales, with a specific focus on nitrogen compounds.

Franz Conen is a research fellow at the Department of Environmental Sciences at the University of Basel, Switzerland. He 'was inspired by Keith Smith to become a scientist and to study greenhouse gas emissions from soils, which he contentedly continues to do after 15 years'.

Paul Crutzen is a professor at the Max-Planck-Institute for Chemistry, Mainz, Germany. He was awarded the 1995 Nobel Prize in Chemistry, along with Professors Mario Molina and F. Sherwood Roland, for his work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone. His main research interest is in atmospheric chemistry and its role in biogeochemical cycles and climate.

Cecile de Klein is a team leader and senior scientist with AgResearch, New Zealand. She has been working in the N2O research area for almost 20 years and was a lead author of the N2O chapter of the Intergovernmental Panel on Climate Change's 2006 Revised Guidelines for Greenhouse Gas Inventories. Her main research areas focus on the development of on-farm tools and technologies for reducing N2O emissions from pastoral systems.

Richard Eckard is an associate professor with the University of Melbourne and Principal Scientist of Climate Change Research with the Victorian Department of Primary Industries, Australia. He is a science adviser to the Australian government on their mitigation policy and research investments into mitigation and adaptation research. He serves on the science committee of the International Greenhouse and Animal Agriculture Conference, having published papers on both enteric methane and nitrous oxide mitigation and modelling.

Alina Freing studied mathematics before she came to the IFM-GEOMAR, Leibniz Institute for Marine Sciences, Kiel, Germany, to start a PhD on the production and emissions of oceanic nitrous oxide. She successfully completed her PhD in December 2009 and is now working as a postdoctoral researcher at IFM-GEOMAR.

Annette Kock is a PhD student at the IFM-GEOMAR, Leibniz Institute for Marine Sciences, Kiel, Germany. Her work involves the investigation of production and transport pathways of nitrous oxide in the tropical oceans.

Carolin Löscher studied biological oceanography at IFM-GEOMAR, Leibniz Institute for Marine Sciences, Kiel, Germany. She started her PhD project on the sensitivity of the oceanic biological nitrogen cycle to changes in dissolved oxygen in 2008. Her main research focus is on the biological formation of nitrous oxide by microorganisms in tropical ocean areas.

Arvin Mosier retired as a research chemist with USDA/ARS in Fort Collins, Colorado, in 2004. During his last 20 years with Agricultural Research Service, he conducted research in the area of soil nitrogen transformations and its relationship to gaseous losses of nitrogen compounds from the soil to the atmosphere. He currently serves in an advisory capacity on N-related projects in the US and internationally.

Albrecht Neftel is a senior research scientist at the Swiss Agroscope Reckenholz-Tänikon Research Station in Zürich. A physicist by training, with a background in ice core analysis, his main interests are biosphere-atmosphere exchange process of agroecosystems, with a focus on reactive nitrogen species.

Laurent Philippot is Director of Research at the French Institute for Agricultural Research (INRA), in Dijon. His main research interest is to understand the ecology of denitrifiers and their role in ecosystem functioning. Recent work focuses on the importance of the size and diversity of the denitrifier community in regulating the denitrification process and production of the greenhouse gas N2O in soils.

Keith Smith, the editor of this book, is an honorary professorial fellow in the School of Geosciences of the University of Edinburgh, UK, though he now lives in southwest England. His main research work in recent years has been on the exchange of greenhouse gases between soils and plants and the atmosphere, and mitigation of emissions. He was recognized by the Intergovernmental Panel on Climate Change as having contributed to the IPCC's shared award of the 2007 Nobel Peace Prize.

Elke Stehfest is a researcher in the IMAGE team at the Department of Climate and Global Sustainability of the Netherlands Environmental Assessment Agency (PBL). She is working on applications and further development of the land and climate part of the IMAGE model. Her current research focuses on modelling of crop production and land use, land-related mitigation options, biofuels, and projections and policy options for global land use.

Tony van der Weerden is a senior scientist with AgResearch, New Zealand. While he began his research career on ammonia emissions from grassland systems, his current interest lies with nitrous oxide emissions from pastoral systems with a focus on development of mitigation strategies.

Chris van Kessel is a professor and Chair of the Department of Plant Sciences at the University of California, Davis, USA. His main research over the past 25 years has been on soil nitrogen and carbon cycling in agro-ecosystems under ambient and elevated carbon dioxide concentrations and its impact on greenhouse gases and crop productivity.

Reinhard Well is a soil scientist at the Institute of Agricultural Climate Research in Braunschweig, Germany. His main research work has been on carbon and nitrogen cycling in soils and aquifers with special emphasis on denitrification and N2O turnover. Currently, his responsibilities focus on the role of reactive nitrogen in the greenhouse gas budgets of agricultural ecosystems.

Peter Wiesen is Professor of Physical Chemistry at the University of Wuppertal, Germany. His main research work in recent years has been on the emissions from vehicular traffic, the oxidation capacity of the atmosphere and the development of ultra-sensitive analytical instrumentation for the detection of atmospheric reactive nitrogen species.

Wilfried Winiwarter is a senior research scholar at the International Institute for Applied Systems Analysis (IIASA) in Laxenburg, Austria, and also a senior scientist with the Austrian Institute of Technology, Vienna. A chemical engineer by training, his main interests include the release of trace constituents into the atmosphere and their subsequent fate, and their treatment in integrated assessment models, with a particular focus on reactive nitrogen compounds.

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