Founder and CEO

Course Leader

Martina Frank is a public health specialist with over 20 years of experience working in global health. She has developed and managed programmes for children, youth and disadvantaged communities in Asia, Eastern Europe, Latin America and the US. Most recently, as the head of health programmes at an international children's rights organization in Zurich, she developed its health strategy and managed projects in Albania, Kosovo, Myanmar and Tajikistan.  She has expertise in reproductive, maternal, newborn, child and adolescent health, nutrition, health promotion and disease prevention. Recently, she completed advanced studies in nutrition and disease prevention at the  ETH Zurich (CAS ETH Nutrition 2017). 

Martina received a master's degree in Public Health from Columbia University in New York (M.P.H. 1999) and her bachelor's degree in Social Anthropology from the University of California, Berkeley (B.A. magna cum laude 1997). She has two daughters and lives with her family on Lake Zurich.




Founder and Course Leader


Karin Frei Sawaneh worked for the past 10 years at an international children's rights organization in Zurich. She developed its children's rights and child protection programme strategy and actively participated in implementing programmes in these areas in Switzerland. She studied Social Anthropology and Geography at the University of Zurich (M.A. 2005). For her master's thesis about the relationship between industrial transitions and over usage of natural resources, she spent eight months in Mali conducting field research.

Currently Karin is studying at the Zurich University of Teacher Education to become a Kindergarten/Primary School teacher. She has two sons and lives with her family in Zurich.



advisory board

The advisory board supports the content of LimeTree Camp and is comprised of experts from organizations working in the sector of nutrition, health, movement, sustainability and pedagogy. 

Martina Brunner

Primary School Teacher, Horgen 

Martina Brunner has been a dedicated and enthusiastic primary school teacher for many years. Very important to her are the well being and development of the children in her classes. She has also been involved in various health promotion projects in the local school community. Currently, she is participating in a continuing education programme at the HfH in Zurich, focused on children with special needs. With roots in the Lake Zurich area, Martina loves the outdoors, swimming in the lake or hiking in the nearby forests. For her big family, including her four children, she enjoys cooking and baking.

 Germaine Christen Sandoval

Certified Nutrition Advisor, HF, tibits

Germaine Christen Sandoval began working at the restaurant tibits in the Front Team in Basel nearly 10 years ago. There her interests in healthy and freshly prepared foods further increased. To deepen her knowledge, she decided to attend studies in nutrition and dietetics at the Bern University of Applied Sciences. She then joined the Food & Beverage Team at tibits, where she continues to implement her knowledge.  After her years working for tibits, she is still full of passion for her work. In her free time, Germaine loves to travel the world, explore new kitchens and to cook with her young son. 

Judith Ellens, MSc ETH

Founder and Head of Science, Eaternity 

Judith Ellen is founder of Eaternity. Eaternity's vision is to establish sustainable nutrition in society and to function as the link between science and the implementation of scientific findings. Eaternity makes an automized CO2 und sustainability management for the food sector and for private households possible. Judith studied Philosophy and Biology at the University of Leiden in the Netherlands and Environmental Sciences at ETH Zurich. She likes to spend time with her son in nature, enjoys yoga and loves experimenting in the kitchen. 

Prof. Dr. em. Wolfgang Langhans

Wolfgang Langhans was a professor at ETH Zurich for almost 30 years. His research focused on the physiology and pathophysiology of the control of food intake and energy balance, including their disturbances such as obesity and type-II-diabetes.  He also researched the various influences of metabolism on hunger and satiety.  Wolfgang Langhans received several awards for his research. In teaching, he introduced the students to the latest knowledge about the physiology of eating.  He was also president of the International Society for the Study of Ingestive Behavior (SSIB) and of the Swiss Nutrition Society (SNS).  

Michael Oyewale, MSc ETH

Movement Researcher, Schulthess Klinik

Michael Oyewale is a sports enthusiast. After playing soccer for over 12 years, he now enjoys actively playing various sports. Michael also led soccer training in sports camps for children. Micheal Oyewale completed an interdisciplinary Masters Degree in Health Sciences and Technology at the ETH Zurich.   Prior to his current work in research at the hand surgery department of the Schulthess Klinik, Micheal conducted sports and movement research. 

Prof. Dr. oec. troph. Sabine Rohrmann

Head, Cancer Registry of

Cantons Zurich and Zug

Sabine Rohrmann is a nutritionist and public health expert with expertise in conducting large-scale studies on the association between diet, lifestyle and risk of chronic diseases, such as cardiovascular diseases and cancer. Among other studies, she examined the effect of high meat consumption on cancer risk. Her current projects also examine differences in vitamin D status in pregnant women and newborns and the effects of vitamin D deficiency on health. 






We thank the School Health Services of the City of Zurich, the Swiss Nutrition Society and Menu and More AG

for their teaching material.