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An urban geographer and environmental psychologist, Heléne Clark works with organizations engaged in social change to build their capacity to develop clear goals, gather knowledge about results, and expand the impact of critical social interventions. Dr. Clark and a colleague founded ActKnowledge to provide rigorous research, planning and organizational development skills to the social sector. Heléne has been the lead evaluator on numerous initiatives and served as advisor to many other evaluations around the U.S. and in the United Kingdom. Dr. Clark incorporated the “Theory of Change” methodology into ActKnowledge’s work, and has led ActKnowledge to be the pre-eminent developer, facilitator and trainer of this method. Her international work includes the development of not-for-profit organizations in Moscow, various projects in the U.K., and work with numerous international non-government organizations in the developing world. Heléne has served on the Board of Directors of Housing Conservation Coordinators in New York City for eight years. Prior to founding ActKnowledge, Dr. Clark was Associate Director of the Center for Human Environments, and taught courses in urban and economic geography, environmental psychology, housing policy and research methods. She has published widely on housing and community development policy topics, as well as education and youth development.