Jo Lines is a public health entomologist, who has worked on the practical problems of mosquito control since 1983. He contributed to the development, evaluation and large-scale implementation of insecticide-treated mosquito nets. A good number of the methods and ideas the emerged from this work later became conventional standards and are still used today. From 2009 to 2012, Jo was Coordinator of the Vector Control Unit of the Global Malaria Programme in the World Health Organisation, Geneva, where he led the development of the Global Plan for Insecticide Resistance Management in Malaria Vectors. He left the WHO to return to the world of research, with a focus on the landscape epidemiology of malaria and other vector-borne diseases.