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Governing Body

As a Belgian not-for-profit association, ISF (International School of Flanders) is managed by a Board of Directors with in-depth experience in International Education and Strategy, including broad business management and personal development skills.

The key responsibilities of the Board include:

  • Legal probity of the school, i.e. ensuring the school is operating according to Belgian law.
  • Financial probity of the school, i.e. approving the annual and long-term budgets, approving the annual school fees & reviewing financial reports.
  • Long-term strategic planning, i.e. setting the vision and long-term strategic direction.
  • Policy Setting, i.e. determining, together with the Executive Head, needs for new policies and approving policy changes and new policies.
  • Recruitment, appointment, and evaluation of the Executive Head.


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From left: Rianne Vandersteegen-Buist, Kaisa Sorjonen, Mike Nwanegbo


Kaisa Sorjonen – Board Chair 

Kaisa has been a Board Director of ISF since 2013 and was appointed as a Board Chair in January 2020. She is also a Board Chair for ISF International Daycare and a director of Rainbows vzw, overseeing ISF’s co-investment in two international day-care creches in Antwerp.

In 2010, after ten years at Euroclear Bank in Brussels in various management roles, Kaisa became Business Manager at Antwerp British School, with responsibility for Finance, Business, HR, Marketing and Facilities. With her partner, she owns Navitas Group and, in January 2013, launched ‘Food for Kidz’, providing healthy meals for crèches, primary and secondary schools in the Antwerp area.

Kaisa holds a Bachelor's degree in International Business Management and a Masters in HR from the University of Salford in Manchester, UK. She is fluent in Finnish, English, and Dutch and has two children.

Isf retouched 021 1Pastor Mike Nwanegbo – Board Director 

Mike is a pastor, author, motivational speaker, and recording artist. As a young man, Mike was a powerful and skillful footballer and played semi-professionally in Belgium between 1992-95.

In 2002, Mike was sent from England to lead the RCCG New Life Assembly church in Antwerp. New Life Assembly is a family and international parish with over 19 nationalities and is now one of the biggest churches in Belgium.

A graduate of the University of Port Harcourt, Nigeria, and also of the Continental Theological Seminary in Brussels, Mike is married to Pastor Boma Nwanegbo, and they are blessed with three lovely girls who have all attended ISF.  He is, therefore, also the Parent Representative on the board.

Isf retouched 019Rianne Vandersteegen-Buist - Board Director

Rianne previously worked as a registered nurse in Holland. In 2005 she started a Daycare in Antwerp and followed with a second daycare in 2013 with the assistance of ISF Trust.

In 2016 Rianne assisted ISF Waterloo in establishing ISF International Daycare in Waterloo and the following year in Tervuren. She is also a Director of ISF International Daycare. 

Rianne is an active member of the Local Consultation Childcare in Antwerp.  She is a graduate of Leiden University and holds her MA in Developmental and Educational Psychology.

Rianne is married to Louis Vandersteegen, and they have two children and two foster children. 


The Board of Directors is supported by an Advisory Board consisting of the Executive Head of ISF, teacher and parent representatives from both Waterloo and Tervuren campuses and industry experts whose skills and knowledge benefit the school community. The members of the Advisory Board act as a safeguard to ensure the school lives up to its Mission & Values. The member's aid decision making by providing wider perspectives and expertise to the Executive Head.

For the 2023-24 school year, the Advisory Board representatives are: 

Belinda Yates Executive Head of ISF 

Beatriz Rocha 

Sarah Hodges

Teacher Representatives of Waterloo campus
Cristina Bueno Vila Teacher Representative of Tervuren campus

Veronique de Ruddere

Roberto Spreafico

Hari Raguraman

Parent Representatives of Waterloo campus
Ewa Woods Parent Representative of Tervuren campus

Nicole Rodrigues Dinath

Fahad Alshammari

Student Representatives

To contact the Board directly, please send an email to