Sebastián Welisiejko

Chief Policy Officer, GSG Impact

Argentinian economist specialized in economic development, impact investment, sustainable finance and public policy, with vast global experience in urban development, conflict economics and impact transparency. 

Sebastián is a Senior Advisor to GSG Impact, the world´s leading network and impact ecosystem building organization, and a partner at Latin American impact firm New Ventures.

Representing GSG Impact, Sebastián headed the Secretariat of the Impact Taskforce (ITF) established under the 2021 UK presidency of the G7. He is also an inaugural member of the inaugural Sustainability Consultative Committee of the International Sustainability Standards Board (ISSB) established by the IFRS Foundation, of the Impact Valuation Standards Board of the Capitals Coalition (IVSB, successor to the IFVI’s VTPC), and of the Sustainability Reference Group of the International Public Sector Standards Board (IPSASB).  

Previously, he served as Vice-Minister 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.   

Sebastián holds a BA in Economics from the University of Buenos Aires (Argentina) and an MSc in Economic Development from the University of Sussex (UK). 

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