Leo den Hartog is director of research and development at Nutreco and a professor at Wageningen University in the subject of animal nutrition in a circular economy.

Leo M. Zucker has served as a project & research associate of Emerging Markets Forum and Centennial Group International since July 2017. In this role, he has contributed to numerous research projects on topics such as infrastructure development, fiscal management, climate change, health care access, and international organizations.

Leon Wang is international executive vice-president and China president at AstraZeneca. He is responsible for overall strategy driving sustainable growth across the international region, including China. Leon joined AstraZeneca China in March 2013 and was promoted to become its president in 2014. Under Leon’s leadership, China became AstraZeneca’s second-largest market worldwide, and AstraZeneca became the largest pharmaceutical company in China.

Leonardo Civinelli Tornel da Silveira has over a decade of experience dedicated to ending poverty and hunger. He is currently pursuing a midcareer master's degree in Public Administration at Harvard University's John F. Kennedy School of Government.

Leonce Dieudonné Sessou is executive secretary at the African Tobacco Control Alliance, which is dedicated to the prevention of a tobacco epidemic in Africa. Leonce oversees the alliance’s interventions by providing guidance to civil society organizations for monitoring, exposing, and denouncing tobacco industry interference. He currently coordinates monitoring and response initiatives in 15 countries to support the implementation of policies compliant with the World Health Organization’s Framework Convention on Tobacco Control.

Leow Yangfa is a registered social worker and executive director of Oogachaga. Oogachaga is Singapore’s most established LGBTQ community organization, working with LGBTQ individuals, couples, and families since 1999.

Lesley-Anne Knight is CEO of The Elders since January 2013. Born and raised in Zimbabwe and with over 30 years experience in development, Knight was previously secretary general of Catholic relief organization Caritas International and also worked for CAFOD and HelpAge International.

Leslie Ruyle is an ecologist working across academic disciplines to create innovative solutions to reduce conflict and improve conservation and economic development outcomes for local communities. She is the assistant director of the Scowcroft Institute of International Affairs at the Bush School of Government and Public Service at Texas A&M University, holds a Ph.D. from the University of Georgia, served as a Peace Corps Volunteer in Ghana, West Africa, and has managed university-based initiatives for the National Science Foundation and USAID.

Leslie Wingender is the peace-building adviser on the Conflict Management Technical Support Unit at Mercy Corps, where she assists country teams on the design, implementation, monitoring and evaluation of various conflict management programs around the globe. She holds an master's degree in conflict resolution from Georgetown University and a bachelor's degree in peace and conflict studies from University of California-Berkeley.