About us

We are a loosely organised group of mushroom enthusiasts.

Mark Slegers [RotterZwam]

Mark Slegers

Mark Slegers has been working as a consultant for several years. With his company Blue-Consultant he helps other organisations to be more sustainable. Through RotterZwam he is able to execute sustainability and inspire others to ACT sustainable.




Siemen Cox [RotterZwam]

Siemen Cox


Siemen Cox worked in financial services for 15 years, the last 5 years as an freelance teamleader. But he didn’t feel connected with the branche anymore. Inspired by the Crash Course by Chris Martenson he started to make his life more resiliant and sustainable. First in his private life and since 2013 also his professional life with RotterZwam.



Ivanka Milenkovic [Sistem EkoFungi]

Ivanka Milenkovic
[Sistem EkoFungi]

Educated as a mycologist, Ivanka Milenkovic has made a career out of bridging scientific research and business. She has over 20 years of experience in cultivating mushrooms from waste materials, having realized waste to taste projects in the United Kingdom, Zimbabwe, United States, Colombia, Belgium, Netherlands, Croatia, etc.




Camila Amaya Castro
[Blu France]

We cannot solve our problems with the same thinking we used when we created them. (Albert Einstein). Camila believes the challenges we currently face are considerable, and she is optimistic that we have what it takes to respond to them in a problem-solving manner. However she’s fully aware of how difficult this may seem. This is why her passion and work is all about innovation.

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