Nanno is the Honorary Chair of the European Development Finance Institutions (EDFI), the association of 15 European development banks. He is also Chairman of the Board of Directors of the &Green Fund and a Board member of Banco Sudameris.

Nanno serves on the advisory boards of Forum International and Commonland. He is senior fellow of the World Resources Institute, a global research institute that focuses on critical issues at the intersection of environment and development.

Nanno served on the Management Board of the Dutch Development Bank (FMO) for 21 years, first as CFO and from 2008 to 2016 as CEO. He started his career with FMO in 1987 as an investment officer at the SME department. Prior to joining FMO, Nanno gained experience in development finance in the private sector while working for nearly 10 years in Peru, Mexico and Nicaragua.