The SIOP Secretariat is lead by a team of three professionals who support the Board and the SIOP members in pursuing the Society’s mission.

Mrs Susanne Wollaert
Chief Executive Officer
Mrs Wollaert manages the day-to-day business and supports the board and members on successfully advancing SIOP’s mission and goals through the everchanging and expanding health care environment.
Susanne comes with +10 years of experience in the management of physician healthcare associations and has developed expertise in all the main aspects of running a professional society, including strategy and operations, congresses and meetings, budget responsibility, program development, and communications and publishing activities. She holds a BSc in Int. Hospitality Management (Major in Marketing) from the École hôtelière de Lausanne. She resides in Meierskappel, Switzerland
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Mrs Anelia Atanasova
Administrative Coordinator
Anelia Atanasova, SIOP’s Administrative Coordinator supports the SIOP Secretariat and the Society’s members with all administrative management tasks.
She is engaged with administrative activities and is one of the main contact points, support the SIOP Secretariat, the Board of Directors and the leaders of the Society’s Networks, Committees, Working Groups and Task Forces with the day-to-day business of the Society, its various activities, and operations. She is a lawyer by profession and used to practice in the legal field for 6 years, graduated from the Bulgarian University of Veliko Tarnovo in 2010. She has more than five years experience with a non-profit organizations, which developed crucial skills like attention to culture, community and mission which are a continuous focus in her work. She was involved in different international projects regarding disadvantaged groups, building communications with different parties and coordination of project activities where in the role of Project coordinator worked for Open Society Institute, Sofia, Trust for Social Achievement and others. She took part in different activities for implementation of the project "T.E.A.M.2 - Together wE Achieve More" implemented by the Secretariat of the NCCEII through the administration of the Council of Ministers, funded by the European Union’s Rights, Equality and Citizenship Programme (2014-2020). She has leading role to motivate project teams and monitor project activities, coordinate work with consultants and volunteers in different projects. She resides in Montana, Bulgaria.
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Mrs Tessie Laub
Executive Director for Programs and Strategy
She leads on implementation of SIOP’s Strategy 2021-2025 in collaboration with the SIOP Board of Directors and manages the program work of the Society
She is a seasoned programs specialist who has worked on health, education, and child protection in both development and humanitarian contexts. Prior to SIOP, Tessie worked for the Int’l Rescue Committee in Ethiopia, Bulgaria and the USA, responding to refugee crises and supporting humanitarian response to situations of internal displacement globally. Previously, she worked as a Sr. Coordinator at the Inter - Agency Network for Education in Emergencies and as a Program Specialist at the Watchlist of Children and Armed Conflict, both in New York City. She holds a BA degree in International Relations from Mount Holyoke College and a MA in Politics from Brandeis University. In her spare time, she likes traveling, hiking, and folk-dancing.
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Olga Kozhaeva
Director, Policy Affairs

SIOP staff are available to answer any questions and to give more information on the various activities of the Society including SIOP membership. The SIOP Secretariat does not respond to any questions regarding treatment and is not in the position to assist patients medically and/or financially. For such questions, we recommend that you consult our partnering family and patient organisations’ country offices and contact them directly.

SIOP Office, Stöcklen 16, 6344 Meierskappel, Switzerland
Tel: +41 78 687 9163