Management Team

Ralf Schönborn, Head of Primary School

After many years in school leadership roles at different schools in both Germany and the USA, Ralf Schönborn started at our JSS as a leadership team member in October 2021. He then took over the position of primary school headmaster at both sites on 1 December last year. Ralf studied social pedagogy and worked in a youth home. His two now big "children", Marie and Frederik, in a way live the same spread as Ralf himself: one leg firmly in Germany (Frederik), the other, at least emotionally, in the USA (Marie). He feels that being allowed to work at the JSS is like winning the lottery.

Isabell Weipert, Head of Secondary School

Isabell Weipert studied German and English to become a teacher. Upon graduation she took on a teaching position at a Language Immersion School in North Carolina/USA. In 2012 she joined Phorms Education as the founding Head of Primary School at Josef-Schwarz-Schule. From 2017 to middle of 2019 Isabell Weipert worked as Head of Human Resources for Phorms in Baden-Württemberg and took over the management of our Secondary School starting in school year 2019/2020.

Ruben Ebert, Head of College

Since September 2019, Ruben Ebert has been responsible for the conceptual and content development of our upper secondary school. In addition, he is the deputy principal of secondary level 1.

Previously, Ruben Ebert led a bilingual high school in Stuttgart-Fellbach for five years and, as part of this work, introduced a program that combined the International Abitur with the International Baccalaureate. In addition, he taught German and history at private and public schools for many years and was an adjunct professor at the Institute for Literary Studies at the University of Stuttgart.

Lisa Schüfer, Head of Primary School

Lisa Schüfer studied German, Math and Catholic Religion in Ludwigsburg at the University of Education. As a native to Neckarsulm, she enriches the Josef-Schwarz-School Team since 2013. In 2015 she became a member of the Leadership Team and is responsible for all subject teachers and the German department. Beginning in January of 2017 she initially took over the temporary position as Head of the Primary School and is now Head of Primary School.

Lisa Schüfer is currently on parental leave. 

Thomas Frenzel, Managing Director

Thomas Frenzel holds a degree in business administration. He worked at the publishing house Gruner+Jahr in Hamburg for nine years before joining Phorms in 2009. In addition to his work for Josef-Schwarz-Schule, he is the managing director of Heidelberg International School and he is in charge of new Phorms Education projects.

Petra Siegel, Administration Manager

Petra Siegel trained as an office manager and worked for many years as a management assistant at Kaufland. She is a member of the founding team at Josef-Schwarz-Schule and is responsible for the administration.