Mary Njenga is a bioenergy research scientist at World Agroforestry and a visiting lecturer at the Wangari Maathai Institute for Peace and Environmental Studies, University of Nairobi. Her research focuses on sustainable and efficient biomass energy production and use systems including circularity, and link to the environment including climate change, livelihoods and rural-urban linkages. She holds a Ph.D. in management of agroecosystems and environment from the University of Nairobi. She has over 20 years of experience in research and development on dryland natural resource management, urban agriculture, sustainable biomass for energy and biochar, circular bioeconomy for food and bioenergy and climate impact assessment. She has produced over a hundred publications, including journal papers, books and book chapters, policy and technical briefs.