Ken Giller is Emeritus Professor in the Plant Production Systems group at Wageningen University. Ken’s research focuses on smallholder farming systems in sub-Saharan Africa, and in particular problems of soil fertility and the role of nitrogen fixation in tropical legumes. He has led a number of initiatives such as the Bill & Melinda Gates Foundation funded N2Africa - Putting Nitrogen Fixation to Work for Smallholder Farmers in Africa - http://www.n2africa.org/. This project worked extensively in Ethiopia. Ken has >500 peer-reviewed papers and has been on the Web of Science list of Highly cited researchers (top 1%) since 2016. He has supervised over 100 PhDs successfully – more than half from African countries. Ken joined Wageningen University as Chair of Plant Production Systems in 2001 after holding professorships at Wye College, University of London, and the University of Zimbabwe.