Jos Vaessen, PhD, has been an adviser on evaluation methods at the Independent Evaluation Group of the World Bank Group since 2016. Since 1998 Jos Vaessen has been involved in evaluation research activities, first as an academic and consultant to bilateral and multilateral development organizations, and from 2011 to 2015 as an evaluation manager at UNESCO. Jos is a member of the Evaluation Advisory Panel at UNICEF and regularly serves on reference groups of evaluations for different institutions.
Sebastian Lemire, PhD, is an associate at Abt Associates. He brings over 15 years of experience designing and managing large-scale, multiyear evaluations in the fields of education, social welfare, and international development. His publications center on innovative approaches and analytical techniques for theory-based impact evaluation. Sebastian currently serves on the Editorial Advisory Board of Evaluation and as an associate editor for the American Journal of Evaluation.
Barbara Befani, PhD, is an evaluation methods specialist with 15 years of experience in research, training, and advisory work. She specializes in hybrid (quali-quanti) methods for impact evaluation; the theory and practice of methods choice; and unified approaches to evaluation quality (that apply to qualitative, quantitative, and mixed method designs). She is or has been an associate of the Institute for Development Studies at the University of Sussex, the University of East Anglia, and the University of Surrey.