Leadership and Administration Team

​​Dr. Zalba brings over 24 years of international education experience and a background in leadership and teaching roles across the globe. As Primary School Principal, she brings a wealth of expertise to our school community. Her passion for education and commitment to student success make her a valuable leader at ISB.

Ms. Hasanovic serves as our Finance and Business Director at ISB, bringing a wealth of experience and expertise to her role. With dual citizenship of Serbia and the USA, Ms. Hasanovic's background encompasses roles at leading companies such as Tetra Pak and Percussion Software. Ms. Hasanovic's tenure since 2006 and professional training from Boston University uniquely position her to oversee all administrative and logistical aspects of running ISB, ensuring financial stability and operational efficiency.

Mr. Nikolic, our IT Director, has been a pivotal part of the ISB community since 2005. With a Bachelor's and Master's degree in Information Technology Management from Union University in Belgrade, Mr. Nikolic brings extensive expertise to his role. His prior experience includes providing IT support to ISB since 1996 and serving as an IT Manager at the USAID-dependent NGO, International Relief & Development.

Mr. Zarubica, our Facilities Manager, is one of our longest-serving employees at ISB, having been with the school since 1992. He oversees maintenance, custodial services, transportation, and campus security, ensuring the smooth operation of our facilities. With an Associate degree in History from the University of Belgrade, Mr. Zarubica also plays a key role in organising school events both during and outside regular work hours.

Dr. Lilly Balos, MSc GP FM has been employed at ISB as our school doctor since 2003. In addition to that role, Dr. Lilly has been in charge of the ISB Crisis Response Manual and coordinates the annual CPR and First Aid training for ISB faculty and staff. After graduating in the field of medicine from the University of Belgrade in 2002. Dr. Lilly obtained her Master of Science degree in Medicine in 2010 in the field of Diabetes in Children. She successfully completed the Specialist Program in General/Family Medicine in 2012. She acquired the General Medical/Family Medicine Practitioner's License from the Serbian Medical Chamber in 2009. Dr. Lilly continues to take university-sponsored medical programs and pursue other professional development opportunities that help her in providing health care services to our students and faculty.

Mr. Bollhorn, our Head of Marketing and Communications, joined ISB in October 2018. With a background in both education and marketing, he has produced content for schools in Africa and Asia and worked on the marketing team at UWC South East Asia. Mr. Bollhorn has taught DP Design Technology, MYP Design, and Visual Arts at international schools in Dar es Salaam, Tanzania and Singapore. A Canadian citizen, he holds a Master's in Education specialising in Technology Integration, a Bachelor of Teaching, a Bachelor of Media Arts, and a Diploma in Cinema, Television, Stage, and Radio.

Mr. Wain joined ISB in August 2021 from an international school in Qatar where he worked as the Deputy Head of Primary School and the Director of Sport. Prior to that, he spent four years working as the Head of Physical Education and Director of Student Leadership at an international school in the USA. His professional experience also includes teaching PE at a public school in the UK. Mr. Wain obtained his Master’s degree in International Education from King’s College of London, and his Bachelor’s degree in Sports Development and Physical Education as well as his teaching certificate from Liverpool John Moores University, UK.

Meet Ms. Ivana Garic, our Admissions Manager at ISB. Ivana joined ISB in 2006 as the Primary Principal's Assistant and has since held various roles, including Office Manager and Admissions Officer. With a wealth of experience and dedication, Ms. Garic plays a pivotal role in guiding families through the admissions process and contributing to our vibrant community.

Ms. Rizopoulou joined ISB in August 2023 as the IB Diploma Programme (DP) Coordinator. With a 17-year career in international education, she has held leadership roles, including Director of Teaching and Learning and K-12 Curriculum Coordinator at Shanghai Singapore International School. Ms. Rizopoulou has extensive experience with the IB, serving as an IBEN Programme Leader, Evaluation Leader, Course Reader, examiner, and workshop leader. She holds Master’s degrees in Educational Leadership (UK) and European Culture and Literature Studies (Greece), along with Bachelor’s degrees in French Language and Literature (Greece) and English in Secondary Education (Norway). Ms. Rizopoulou also co-founded a successful school in Greece, where she served as a teacher and Director of Studies.

Mr. Badham is a dual citizen of Norway and the UK who joined ISB as the Athletic Director/Activities Coordinator in August 2021. Previously, he served as the Head of Athletics and Activities at an international school in Switzerland for four years, as the Whole School Activity Coordinator and PE Teacher at an international school in Qatar for three years, as well as a Primary Teacher in various public schools in the UK. Mr. Badham obtained his Bachelor’s degree in Physical and Outdoor Education from La Trobe University in Australia.