Adriaan Mels is Chair of the Supervisory Board and a WASH expert. He is currently Regional Director for Asia and Africa at Vitens Evides International (VEI) and Programme Manager for WaterWorX. In the past, he has held roles as: Team Lead of Urban Environmental Management Group at Wageningen University, Lecturer IHE Delft and International Consultant LeAF, and has a PhD in Environmental Technology.

Erlijn Sie has 15 years of experience working with multi-nationals and leading and growing social ventures. She is the co-founder of Micro-credits for Mothers and Credits for Communities and was Managing Director of the Banking with the Poor Network and Hands On Microfinance. Currently she works at Ashoka – the world’s largest international network of social entrepreneurs – with blue chip companies to transform business into a force for good through collaboration with social innovators. Erlijn has devoted her career to contributing to a more just and inclusive economy. Erlijn holds master’s degrees in Management Sciences and Asian Studies.

Hanny has 30 years of experience working in international NGO’s. She started her career pioneering micro-finance with the Hivos Triodos Fund in the 90’s and later switched to strategy and programme management in the WASH sector. She also has previously held a position as the Director of WASTE.  Hanny has devoted her career to promoting and supporting systems change for a more just and sustainable society with equal opportunities for everyone. Hanny holds a master’s degree in consumer and business sciences from Wageningen University.

Frank Wijngaard joined the Board in 2024 and is Chair of the Audit Committee. He has over 20 years of experience in international cooperation. Frank lived and worked in Africa for 10 years, as well as working another 11 years for Amref Flying Doctors and Aidsfonds/Soa Aids Nederland in the Netherlands. During his Amref years he collaborated with WASTE on joint programmes. Frank has always been keen to use his financial and administrative expertise to support the mission, goals and creation of a strong organisational culture. Currently he is a senior business controller for Magentazorg. He holds bachelor’s degrees in Education and Business Administration.