Economist and Senior Marketing Specialist at the World Agroforestry Centre, Nairobi (since March 2009). Formerly, Scientist and Coordinator of the Economic Impact Assessment Horticulture Project of the International Centre of Insect Physiology and Ecology, Nairobi (2005-2009). Formerly, Research Associate at the Institute of Agriculture and Development Economics, Faculty of Economics and Business Administration, Leibniz University of Hannover, Germany (98-2005). Postgraduate Fellow, Domestication of Indigenous Fruit Trees Project of World Agroforestry Centre, Harare, Zimbabwe (99-2000). Professor of Development and Agricultural Economics (since 2001) and Director of the Institute of Economics in Horticulture (since 1998) Formerly Professor of Economics in Horticulture (1994 - 2001), Faculty of Economics and Business Administration, University of Hannover, Germany; formerly Director of International Programs of the Leibniz University of Hannover and Chairman of the Senate Committee on International Relations of the Leibniz University of Hannover (2000 - 2003). Spend 10 years working in development assistance in Asia with GTZ and in development research and teaching with the Asian Institute of Technology (AIT); Since 2001 member of the Standing Panel on Impact Assessment of the CGIAR, worked extensively as consultant and reviewer for numerous organizations of development assistance, including The World Bank, The Food and Agriculture Organization (FAO),The Asian Development Bank, the European Union, GTZ, , the German Development Bank (KfW) and the CGIAR.