About Me
I’m a connectionist: my brain can’t stop making links between ideas, people, projects and places. I’m a holist: everything and everyone matters all the time. And I’m strategist: how can we make change happen together?
I’m Jotham Sietsma

Facilitating collaboration has been my bread and butter for more than 25 years. From running cooking workshops as a student, to organising one of Europe’s largest cultural collaboration programmes: it’s in my DNA to bring people together across borders to learn from each other, forge deep connections and make this world a slightly better place.
Educated as a political scientist, I developed my competences in various contexts. From public diplomacy for the Dutch government to HIV/AIDS campaigns in Central Asia, and from civil society networks across Europe and the Middle East to leading a non-profit in Berlin. I realised that shifting perspectives is a key ability to collaborate effectively.
Over the last 7 years I have honed my skills in change management, process design and facilitation, strategy development, partnerships, networks, governance, team structure and work culture. Although I have mostly worked in civil society sector, I’m also well versed in impact investment, cross-sectoral collaboration and multi-stakeholder approaches. I feel at home working with thematics like social and climate justice, culture and creativity, (non-)formal education, and intercultural as well as intersectional approaches. Since 2024, I’m a senior associate at Reos Partners, an international social impact company specialising in enabling transformative collaboration.
Born and raised in the Netherlands, I can call Amsterdam, Montreal, Kyiv Istanbul, and Berlin my home. I’m now based in Leipzig with my family.
My competences
Facilitation, Process design, Collaboration, Leadership, Strategy, Partnerships, Program development, Fundraising, Philanthropy, European funding, Team management, Coaching, Consulting, Organisational development, Networks, Intercultural and intersectional, Communications, Civil society, Culture and creativity, Digital and AI, Social impact investing, Social and climate justice, Europe and the world
My approaches
Also me:
