Our Team, Our Opening Hours and How to Reach Us

Dirk Müller-Maguhn has been the Principal of SIS Swiss International School Kassel since 2025.

Originally from Hamburg, he studied to become a secondary school teacher in Chemistry and English at the Pädagogische Hochschule  in Kiel. He later completed an additional degree in Primary Education (German, Mathematics, and General Studies) at the University of Hamburg. After his teacher training and several years of service in Korbach, North Hesse, he moved to Bad Zwesten, where he taught at both a secondary school and a grammar school for nearly two decades. Most recently, he spent nine years as Head of the Secondary School Division in the school leadership team before transitioning to SIS Kassel.

He especially enjoys teaching Chemistry and likes to challenge students with tasks that require forward-thinking and creative solutions. As principal, he focuses on school quality and the individual support of students on their journey into the world.

Scott England has worked at SIS Kassel since the school opened in 2014. Since then, he has taught Music, Information and Communication Technology. In 2020 he was appointed Vice Principal.

Scott is a graduate of Ithaca College with a Bachelor of Music and Music Education. He then received a Master of Music from the Manhattan School of Music . Before moving to Germany, he taught Music at a public school in the South Bronx, New York. He also worked as a professional chorister with The New York Choral Artists, the choir of the New York Philharmonic and other choirs in New York City.

Since moving to Germany, Scott has worked as a private English teacher, and as a music teacher with an international school in North Rhine Westphalia.

Scott is from the United States and grew up in Upstate New York. He is a student-centered teacher who wants to teach his students how to become good citizens of the world.

Marleen Enders has been teaching at SIS Kassel since 2023 and took over as Head of Upper Secondary School in 2025.

She studied to become a secondary school teacher with a focus on Mathematics and Chemistry at the Ruprecht-Karls University in Heidelberg. After successfully completing her teacher training in Darmstadt, she initially taught at a general secondary school there.

A work-related move brought her and her family to Kassel, where she was ready for new challenges and looking for an inspiring work environment. She found this at SIS Kassel, with its diverse mix of cultures among both students and staff.

A formative period in Marleen Enders’ youth was spent in the United States, where she attended a public school for four years. This experience had a lasting impact on her perspective regarding different teaching and learning cultures and sparked her interest in international approaches to education.

At SIS Kassel, she brings this experience into her work with the upper school, preparing students for the Abitur and the International Baccalaureate Diploma.

Mathew Calloway joined SIS Kassel in 2018 and became IB Coordinator in 2023, leading the school’s journey to become an IB World School in 2024.

Mathew grew up in the North West of England and studied Mathematics at the University of Edinburgh. He completed his teacher training at the University of Manchester and worked across schools in the North of England. He relocated to Germany in 2014, initially teaching the IB Diploma Programme at a British international school before moving to SIS Kassel.

He is passionate about fostering joy in Mathematics and supporting bilingual education, and he enjoys creating opportunities for students to explore their potential and develop the skills and confidence to thrive in a global community.

Nicole Mitreska joined SIS Kassel as a primary school teacher in September 2014 and took over as head of primary school one year later.

She completed her teacher training for primary and middle school at the University of Hamburg in the subjects of sociology, mathematics and educational science. After her traineeship, she took over as class teacher of grade four in Hamburg Neurahlstedt. She then continued as class teacher in fifth and sixth grade.

After gaining initial professional experience, she moved to Great Britain. Here she was not only able to gather experience as a substitute teacher, but also gave additional lessons at an English primary school for pupils who needed to be supported and challenged, especially in mathematics and literacy. She was particularly interested in the supplementary lessons in Guided Reading.

After twelve years, Nicole Mitreska returned to her hometown and now uses the experience gained abroad to shape young people into responsible, well-informed, courageous, questioning and creative individuals.