Leadership
At Symbiosis, we’re not just building a platform – we’re building trust, collaboration, and meaningful change.
This is where you get to know the people guiding that mission. Our team brings together diverse experiences, shared values and a passion for making good easier to do.
Whether we’re strategizing behind the scenes or joining you in the field, we’re in this together – and always just one click away.
Fatima Azzahra Mastari – Engagement Catalyst
Fatima is a Paris-based implantology specialist who also has transversal experience in lecturing and law. She is a Harvard CLIMB alumna and founder of ChildLink, a nonprofit foundation for children with special needs.
Ulrich Nguepini – Treasurer
Ulrich specializes in finance, regulatory and management consulting. He has more than 15 years of experience working in the financial sector. He is a Harvard CLIMB alumnus, based in Paris.
Gerben Sam – Head of Strategic Impact & Founder
Gerben brings over a decade of leadership in pharmaceutical healthcare and GMP production, with a focus on innovation and operational excellence. As founder of The Symbiosis Foundation, Harvard CLIMB alumnus, and Lean Six Sigma Black Belt, he combines expertise and a deep commitment to creating meaningful social impact through strategic partnerships and sustainable solutions. He lives in Zandvoort in the Netherlands.
Heleen Geilenkirchen – Board Secretary & Founder
Heleen has been working in the field of communications and editorial work for 14 years. Currently editor-in-chief at the municipality of Haarlem. She lives in Zandvoort in the Netherlands.
Akos Hajdu – Lead Digital Transformation & Founder
Akos is a data analyst, with a strong analytic expertise. He is passionate about health, fitness & wellness. Akos holds a degree in Biochemical Engineering from Budapest University of Technology and Economics. He has been living in Amsterdam since 2023.
Gaylina Mayieko – Brand & Storytelling Champion
Gaylina is a sustainability Marketing and Communications expert. She is passionate about storytelling and building brands that resonate with SDGs. She holds an MBA and Bachelor of Commerce degrees specializing in Marketing Management. Currently she works for a water-climate fund in Kenya.
Kingsley Essemiah – Advisor (Ecosystem Innovation)
Kingsley obtained a master’s degree in Biomedical Sciences at Vrije Universiteit Amsterdam. He is currently working as a regulatory affairs officer in the pharmaceutical industry.
Kevin Hovius – Advisor (Strategy Implementation)
Kevin specializes in social media strategy. He has experience working for multiple large international technology companies. Kevin lives in the Netherlands.
Eric Ndayisaba – Advisor (Digital Marketing & Engagement)
Eric is a Mastercard Foundation Scholar at African Leadership University, pursuing Entrepreneurial Leadership with a passion for marketing, communication, and community impact. With experience in digital content creation, project management and social media strategy, he has contributed to multiple organizations.