Africa Impact Summit 2025
11th June 2025 | 08:30 GMT+3 | Accra, Ghana
Sebastian Welisiejko
Sebastian Welisiejko
Chief Policy Officer
Sebastian Welisiejko
Sebastián (Seb) is an Argentinian economist specialising in economic development, impact investment, public policy, conflict and urban economics.
From January 2020 Seb acts as Chief Policy Officer at GSG Impact. He also heads the Secretariat of the Impact Taskforce (ITF) established under the 2021 UK presidency of the G7.
Previously, he served as Secretary of State for Socio-Urban Integration at Argentina’s Ministry of Health and Social Development and as Coordinator of Projects at Argentina’s Cabinet Office, was the inaugural Executive Director of the GSG and Chief Economist of The Portland Trust, a British NGO promoting peace and stability between Israelis and Palestinians through economic development.
Seb holds a BA in Economics from the University of Buenos Aires (Argentina) and an MSc in Economic Development from the University of Sussex (UK).