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Leadership and Governance

Lead through example

Our Vision - all of us learn: we inspire and empower each other to achieve

Lead through example

The BIS Leadership Team bundles educational experience and expertise gained in leading schools throughout Europe, Asia and the Americas.

In addition, they prioritize a sense of belonging and shared identity for all members of our school community, whether students, staff or parents. 

We feel a great deal of gratitude for how well BIS is managed.  The school leadership has proficiency and heart, both in equal measure, and it has guided the school to be a wonderful place of learning and community.

Lisa Kelley, Parent

Allow us to introduce our Leadership Team:

Pat Baier


Pat was born in Singapore but grew up and studied in Great Britain. She has been at the forefront of international education for the past 25 years, as the Director of  BIS and the International School Hannover Region.

Pat is deeply committed to the International Baccalaureate because of its relevance to 21st century learning and emphasis on compassionate and responsible citizenship. 

Pat’s husband is German. They have two daughters and three grandchildren. Pat enjoys reading, hiking and cycling.

Alex Whitaker

Primary School Principal

Born in Great Britain, Alex studied Primary and later Special Needs Education. He was also team leader for visual impairment for 400 schools. More recently he was Assistant Principal and PYP Coordinator in Stuttgart, Germany. 

Alex believes the PYP is the best tool to fulfill our school mission and provide a relevant, challenging, and supportive learning environment for children.

Under the alias Dangerboy, Alex shares his circus skills such as physical theatre, juggling and clowning around. 

Will Tragert

Secondary School Principal

Will grew up in the USA. With a Master’s in Educational Leadership, he worked as a Secondary Math teacher and administrator in the United States, China, and now Germany. Will has great experience teaching and leading in an IB environment.

Will is passionate about creating inclusive and nurturing school communities. He believes every child is capable of learning at high levels and should feel safe, happy, and empowered.

His wife teaches Learning Support in the Primary School. They have three children, who are all BIS Dragons!

Jo Junglas

Head of Student Services and Operations

Jo qualified as a teacher of Physical Education, and Social and Personal Education in Great Britain. She has worked as a Social Educational Expert with and trained in both Clinical and Pastoral Counselling and Excellence in Leadership.

Jo is passionate about enabling and empowering students to work towards reaching their true potential, whether academic, social or sporting, and is a positive example of life long learning.

Married with two children, she speaks German, plays football and regularly participates in running races and marathons.

Sabine Schattenberg

Business Manager

Sabine Schattenberg grew up Germany, where she obtained a master’s degree in Clinical Psychology. She then studied Accounting in the USA, became a Certified Public Accountant and worked for software and accounting companies.
Since moving back to Germany in 2001, she continued her career as the Business Manager at Bonn International School.

Sabine is married to a scientist and has two grown-up sons. She enjoys working out with her girlfriends, gardening, and, if time allows, visiting her sons in Spain and The Netherlands.

Board of Trustees

Bonn International School is a registered non-profit association supervised by a Board of Trustees. The 10-member Board of Trustees is responsible for the long-term development of the school, strategic decisions and school policy. Strong relationships between the Board of Trustees and the school’s Leadership Team ensure a shared vision for the future of our school and resilience in the face of short term challenges.


Silje Skogstad


Silje is a Norwegian national and a long time Bonn resident. She works in Corporate Development for Deutsche Post DHL Group. With two children at BIS, Silje is passionate about education, sustainability and communication.

Sandhya Bala

Vice Chair

Sandhya is an Indian national who works for the United Nations System Staff College. She holds a PhD in Development Economics and International Development. She has two children at BIS in Grades 8 and 10.

Bulend Corbacioglu


Originally from Turkey, Bulend has spent most of his life in Germany and the US. He is an investor who has been improving performance of businesses to make them more valuable. He has been serving on the Board since 2020.

Koko Warner


Koko holds a PhD in economics and leads on adaptation, knowledge and vulnerability at UNFCCC. She ranks in top 20 women in the climate change debate. Koko is mother to two sons who attend Grades 10 and 12 at BIS.

Stephen Arrowsmith

Governance Committee Chair

Steve is British/German and has three kids at BIS in Grades 12 and 9 (twins).
He works for the European Union Aviation Safety Agency on aviation environmental protection strategy. He has served on the Board since 2019.

Mark Sinar

Finance & Personnel Committee

Mark is the Global VP – Human Resources, Safety and Sustainability for Maxion Wheels. The Sinars are long-time residents of Bonn, after moving from the United States. Their children are lifelong Dragons.

Karen Williams

Development Committee Chair

Karen is British but has lived abroad for the last 20 years. She is an upper school parent with a background in marketing, sales and customer experience. She now works in the education sector and holds a PhD in English. She has served on the Board since 2018.

Interested in how we govern and lead our school?

Check out our latest Annual Report 2021-2022.

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