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Louis is Managing Director of the Osprey Foundation, where he leads programmes on water, sanitation and hygiene (WASH) and sustainable energy.  In addition to managing a portfolio of grants and impact investments, Louis works to advance these sectors through wide-scale systems change.

From 2005-2013, Louis founded and led the WASH programme at the Bill & Melinda Gates Foundation, building a cross-disciplinary team and a grant portfolio of more than US$ 400 million. Prior to that, he worked for 15 years at the International Finance Corporation, where he led the environmental finance team from 1997 to 2004. In that capacity, he helped pioneer the impact investing field by building a portfolio of over 30 ventures.

Louis currently sits on several boards and serves as a senior adviser to social ventures and non-profits. He holds a BA in economics from Yale University and an MBA and MA (Development Economics) from Stanford University

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