The school is administered by our Principal and an all-volunteer School Committee consisting of currently nine members, supported by an Administrative Manager and four Part Time Professional Admin Team. All of these positions are supported by parent volunteers working on various teams.

School Committee

Our all-volunteer School Committee sets forth the school mission and policies and manages all aspects of its operations. It reports regularly to its founding organization, the Boylston Schul-Verein in Walpole, MA.

School Committee members are typically parents of students and can remain on the committee for a maximum of two terms of three years each. While the committee collectively works together on general school policies, each committee member has been assigned to specific work areas.

The School Committee members for this school year are:

Holger Kunst, Chair

Dr. Ines Dwyer, Parent Volunteer Liaison [email]

Jennifer Brideau, Communication/Marketing [email]

Stephan Richter, Library Liaison [email]

Dieter Berger, Treasurer [email]

Michael Sassin, IT [email]

Dr. Rainer Haarbusch, Strategic Initiatives [email]
Jenny Jolig, Operations [email]
James Downs, Events [email]

Claudia Bonmassar, Principal

Our Principal brings with her more than 30 years of teaching experience, along with advanced education degrees from Tufts University and Innsbruck University, Austria. Claudia is well-versed in the program and culture of the German Saturday School: After joining our faculty in 1992 and leading a classroom for 10 years, she was promoted to Head Teacher and then took on her current role as Principal. Claudia, a native Austrian, has a solid background in foreign language instruction. She has taught middle school, high school, university, and adult education classes in Austria, France, and in the Boston area. As an administrator both in Europe and the U.S. she has coordinated study tours, facilitated guest speakers, organized teacher workshops, and served as a university supervisor, managing and evaluating student teachers. As an educator and mother of two children, Claudia has chosen this path because she truly appreciates the German Saturday School as a place for people to stay connected. Claudia is currently also a staff teacher for German at the International School of Boston/Lycee International de Boston.

According to Claudia, “The German Saturday School is a place for students and their families to stay connected to their heritage, but also opens the door to families for whom German is a new and exciting adventure. Our challenge is to provide every single student with the appropriate tools to achieve our main goal: the ability to actively communicate in German.” Claudia can also be reached at

Hanna Luecke, Vice Principal

Yvonne Case, Front Desk Manager

Yvonne has been involved in the German Saturday School Boston since 1998. Her four daughters have already graduated from the GSSB and currently her 3 sons are enrolled at the school.

Previous experience at the school includes various substitute teaching as well as parent volunteering. Yvonne is originally from Bern, Switzerland and immigrated to the US in 1986.

In her current position Yvonne is responsible for setting up and running the front desk. She is the point person for teachers, students, parents and visitors.  Yvonne can also be reached at

Daniela Mrozinski, Assistant to the Principal

Daniela joined the GSSB Community 2 years ago shortly after she moved with her family from Germany to the US. While helping out in various classrooms she also joined the administration team last year to assist Claudia Bonmassar with administrative tasks and support Yvonne at the front desk every Saturday.

In Germany, she has worked in an accounting department and additionally taught French in several kindergartens.

Since 2019 she teaches her own class at the German Saturday School Boston. Daniela can be reached at

Irina Mavrodieva, Registrar/Controller

Irina Mavrodieva administers the registration and financial operations at GSSB.  She holds advanced degrees in Accounting and Business Administration from Northeastern University and is a CPA licensed in the state of Massachusetts. Prior to joining the school, she has worked in the financial sector for 16 years focusing on audit and financial reporting. Besides working in the administration, Irina is also a GSSB parent.  Irina can be reached at