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avatar for Siem Vaessen (Zimmerman & Zimmerman)

Siem Vaessen (Zimmerman & Zimmerman)

Zimmerman & Zimmerman
Managing Director
Netherlands
Mr. Vaessen is CEO at Zimmerman & Zimmerman, an open-source data and visualization company based in Amsterdam, The Netherlands. He serves as technical liaison to the efforts made by Zimmerman & Zimmerman to maintain a sustainable data-engine, enabling organisations like DfiD, UNESCO, Dutch Ministry of Foreign Affairs, UN-Habitat, the Overseas Development Institute and the Dutch Enterprise Agency to build relevant data portals based on the open data format IATI.