Meet The Team

We are a team of six dedicated volunteers based in the Netherlands, united by a deep connection to Tanzania and a shared belief that today's children are tomorrow's future, the key to a greener future.

OUR TEAMS

The heart of our organisation

Teamwork is at the heart of every non-profit organisation, particularly one powered by volunteers working across different countries and cultures. By collaborating with volunteers and partners in Tanzania, we create something meaningful: a bridge connecting knowledge, commitment and mutual understanding.

An individual volunteer cannot address the complex challenges faced by non-profit organisations alone. By working together, ideas become richer, solutions more creative and our collective impact greater. Our strength lies in diversity: different perspectives lead to better decisions and more sustainable outcomes.

Meet our

Dutch team

Founder & Ambassador
Hans Korteweg

"Ten years ago, Greenmanjaro was founded on the belief that young people must help shape the future they will inherit."

CO-Founder & Ambassador
Monique Vogelzang

"I truly believe a cleaner, healthier future starts by educating young minds and empowering them to turn knowledge into action. By giving young people hope and confidence, we help them take the future into their own hands. "

Board member, Co-chair
Penny Vossen

"I love working with young minds. Their smiles light up the world, and their energy, dedication and trust are worth their weight in gold. With over 70% of Tanzania's population under 30, I feel a responsibility to help guide and inspire this generation and put the future in their hands."

Board member, Co-chair
Marjolein Praaning

Beyond our environmental programmes, I am continually amazed by participants' personal growth. As they realise they can make a difference, “their eyes open like flowers.”

Board member, Scholarships
Ellen de Roij

"The children's happy faces and the volunteers' incredible energy keep me motivated. Children quickly turn new knowledge into action. Join us in inspiring them!"

Board member, Operations & Finance
Kim Oostrom

“A child and adolescent psychologist with a son whose middle name is Africa — need I say more? I love the people, their creativity, positivity and tolerance, and believe the future lies with the next generation.”

Partnering

Working together

Our work is rooted in collaboration. Together with local partners, schools and communities, we ensure that our programmes are relevant, inclusive and sustainable.

By building on local knowledge and strengthening existing networks, we support solutions that are created within the community itself.

Learn more
Help Grow
CLIMATELEADERS

Be part of the change and support the next generation of climate leaders. Together, we can move mountains.