our team
We are a young and innovative organization based in Zürich. As an ETH Spin-off, our work is grounded in science and engineering, and elevated by art and education.
rrreefs association was founded in October 2020 by Marie Griesmar, Ulrike Pfreundt, and Hanna Kuhfuß, joined by Josephine Graf a few months later.
In 2023, rrreefs became a social environmental impact business.
Dr. Ulrike Pfreundt
Co-Founder, Head of Science and Development
Dr. Ulrike Pfreundt
Ulrike is an expert in tropical ocean ecosystems, with a PhD in Microbial Oceanography and Genetics. She has developed and led scientific projects in the lab and in the field for more than 10 years. At rrreefs, Ulrike is responsible for scientific strategy and business development.
Marie Griesmar
Co-Founder, Head of Product & Marketing
Marie Griesmar
Marie is an artist and material specialist, whose artistic research and practice have been focused on aquatic ecology for more than 8 years. She understands the behavior of clay like no other and ensures that the design of our system fits its purpose. At rrreefs, Marie leads product development and design, marketing, and public relations.
Hanna Kuhfuss
Co-Founder, Head of Field Operations and Scientific Partnership
Hanna Kuhfuss
Hanna is a marine scientist who worked for different green and social start-ups and NGOs in the field of ecosystem protection and applied marine sciences. As an advanced scientific diver with over 11 years experience in ecosystem conservation and restoration, Hanna leads our field operations. She is responsible for safety underwater and our scientific field and lab experiments.
Josephine Graf
Co-Founder, Head of Business Development
Josephine Graf
Josephine has a background in International Relations with a focus on climate politics. Having worked both in the private and public sector, she has gained first-hand insights into sustainability consulting and international cooperation. At rrreefs, Josephine is driving partnership engagement and business development opportunities.
Mauro Bischoff
Designer & Field Operator
Mauro Bischoff
Mauro is designer and a dive instructor. He has a passion for new challenges and building tools. At rrreefs, he is responsible for creating solutions for each reef implementations, technically and logistically.
