Board of Trustees

As an independent, non-profit foundation, ISA is strategically guided by a Board of Trustees (the Board), a group of dedicated professional volunteers, providing legal oversight to the organisation.

The Board plays a central role in looking out for the long-term interests of the school. Approval of the school’s annual budget, salaries and capital expenditures are amongst a few of the board’s responsibilities. They are the stewards of the schools assets and, through defining the school’s mission, vision and philosophy, they serve as the architects of the school’s future.

The Board of Trustees for the 2019-2020 school year are:

Ton van Nimwegen – Chair and Elected Trustee

Ton van Nimwegen was elected to the Board of Trustees in 2017. He returned to the Netherlands after spending twenty years abroad. He started his career at Unilever, moved on to ABN AMRO and now works for Rabobank. Ton has a Ph.D. degree in Economics. 

He is married to Ângela, a medical doctor from Brazil, and they have two children at ISA: Nathalia and Sebastian.

Joanna Fleming – Vice-Chair and Elected Trustee

Joanna was elected to the Board of Trustees in 2017. She is a physician and a board certified psychiatrist, having worked in Warsaw at the Institute of Psychiatry and Neurology and later as a fellow at the Medical Center of Postgraduate Education. She also has diverse management experience in the pharmaceutical industry, starting at Hoechst Marion Roussel and later Boehringer Ingelheim where she created and headed the Medical Department in Poland, becoming International Product Development Manager at Boehringer’s global headquarters in Germany. While in the US she became a certified Life Coach establishing her own practice. 

She has studied/worked in 8 countries on 3 different continents and while Polish at heart, feels a citizen of the world. The Flemings moved to Amsterdam from the US in 2014.

Joanna and her husband, Scott, have two children attending ISA, where Joanna has been active in the PTA, holding a multitude of positions.

Peter Jun – Secretary and Elected Trustee

Peter was elected to the Board of Trustees in 2018. He earned an MA in International Relations, with high honors, from the University of Amsterdam and a BA in Government (Political Science), cum laude from Harvard College (University).

Peter has been active in professional real estate investing since 1999, having worked for The Praedium Group, Lehman Brothers and Lone Star in New York and London. In 2006, he co-founded a real estate private equity firm, Arminius Group, which actively invests in German real estate. Peter also served on the Board of Trustees at the International School of Zug and Luzern (Switzerland). He has three children attending ISA: Alexander, Megan and Aidan.

Peter was born in South Korea and is a dual US and Dutch national.

Percy Antúnez de Mayolo Kreidler – Elected trustee

Percy was elected to the Board of Trustees in 2019. He holds a degree in Business Administration (Honors) from the Universidad de Lima and an MBA from The University of Chicago Booth School of Business.

He has worked and lived in eight countries across Latin America, North America and Europe.  He started his career with EY, then spent over a decade as expatriate with The Goodyear Tire & Rubber Company until settling down in 2017 in The Netherlands to work at the global headquarters of the Dutch company LeasePlan.

Percy lives in Amsterdam with his family.

Jyotsna Mehra – Appointed Trustee

Jyotsna was appointed to the Board of Trustees in 2016. She earned her Bachelors in English and History honors and Masters in English Literature with honors from Punjab University in India. From the University of North Carolina, she completed her degree in Tourism and Hotel Management. 

Jyotsna is also an accomplished businesswoman, having over 30 years’ experience in owning and managing several hotels and real estate properties in Amsterdam. She came to the Netherlands in 1982.

Her passion for ISA never ceases, and she continues to be an active member of the Indian Community both inside and outside of the school. She is passionately involved with many charities connected with education for underprivileged children and children suffering from Aids. She financially supports two students for college education and her family supports the charitable school in India for children from slums. 

Jyotsna is the mother of two ISA alumni, Ritika (Class of 2004) and Uday (Class of 2012) and during her ten-year tenure as an ISA parent, Jyotsna was actively involved in, and led various committees and initiatives (Indian Community Representative, Parent Advisory Committee member and Coordinator and a Founding Member of SHARE) in the school.

Fernando Lanzer Pereira de Souza – Appointed Trustee

Fernando was appointed to the Board of Trustees in 2017. He holds a B.A. degree in Clinical, Organizational and Educational Psychology from PUCRGS in Brazil. He was a Human Resources EVP at ABNAMRO for 15 years, having moved to Amsterdam in 1996. For ten years he was also a member and Chair of AIESEC International’s Supervisory Group. He owns LCO Partners, a management consulting firm, since 2007, and has been active in many countries as a consultant, coach, public speaker and book author. 

Fernando has two daughters who attended ISA from pre-school to IB graduation in 2009 (Ana Paula) and 2011 (Bruna). He lives in Amstelveen with his wife Jussara, who is a former President of the school’s PTA.

René Witzel – Appointed Trustee

René Witzel was appointed to the Board of Trustees in 2017. He started his career in accountancy at vDien&Co (now PWC), continued in leading management positions in various multinational media companies like Bertelsmann Music Group, Arcade, TMF, Radio10, MTV and is since 2002 Managing Director of JCDecaux Netherlands. Having worked internationally and lived abroad for 8 years in Munich and Dusseldorf he returned in 1998 to The Netherlands. 

René lives in Abcoude with his German partner Antje (Engineer Radiation & Environment) and has two daughters.

Changing of the Guard

The ISA community recently paid homage to two long-standing members of the ISA Board of Trustees, Leo van Os and David Masters.