top of page
Romain Blanc.jpg

Romain BLANC,

Romain began his journey in the forestry world in 2007 with an apprenticeship as a forester-lumberjack in the layered forests of Le Locle – La Chaux-de-Fonds. He then trained as a forester at the CEFOR forest training center in Lyss, then continued with a bachelor's degree in forest sciences at the Bernese University of Applied Sciences (HES) HAFL in Zollikofen. He is now a teacher at CEFOR, a cantonal forest planner in Neuchâtel and a collaborator at the forestry competence center in Lyss.

Gilles BOEUF,

Biologist French, Teacher at the Pierre and Marie Curie University, Sorbonne University, he was president of the National Museum of Natural History and visiting professor at the Collège de France chair “Sustainable development, environment, energy and society”. He was scientific adviser to the Ministry of the Environment, Energy and the Sea, chairman of the scientific council of CIRAD, member of the boards of directors of marine protected areas and Humanity and biodiversity, member of the professional development committee Monaco Science Center.

He is president of the scientific council of the French Agency for Biodiversity and president of the Massane forest national nature reserve (Eastern Pyrenees). He is part of the IPBES office and is a member of the ONF scientific committee. He was a member of the French commission of Unesco.

Claire BOULCH.jpg


An adult trainer for 10 years, Claire Boulch trained in outdoor learning in Finland, where she lived for 3 years. She wrote a research paper in Educational Sciences on the effects of outdoor learning and connection to nature on child development. This university work followed an observation internship in a forest school. The research results were collected in the documentary “Finnish Forest School, Meaningful Education”. Responsible for teacher training at Formiris, Claire was able to identify the needs of teachers and introduce the practice of the classroom outside as a training priority. As independent trainer, she now trains, with enthusiasm, teachers from the Loire region in the practice of the classroom outside.

Dominique BOURG.jpg

Dominique BOURG,

Philosopher, honorary professor, University of Lausanne, he directs the collection "Ecology in questions" and the collection "New Lands" with Sophie Swaton; the “Grands articles” series and the magazine

He is a member of many organizations: National Council for Sustainable Development, Grenelle de l'Environnement, etc. and scientific advice: Ademe (2004-2006), FNH (1998 – 2019), Foresight body of the State of Vaud (2008 - 2017), Zoein Foundation (2018 - ).

His research focuses on ecological thinking, the circular economy, ecological democracy and ecological issues. He has written many books on these subjects.

Paco Calvo.jpg


Professor of Philosophy of Science, Laboratory of Minimal Intelligence, University of Murcia, specialist in cognitive philosophy, author of numerous publications on plant neurobiology and ecological psychology. His latest book “Planta Sapiens” has been translated into several languages.



Lara has been an actress for over 10 years. She works with many companies between Angers and Paris.

Supported by the MONA BLANK company, she signs with "L'arbre endormi" her first writing, a poetic and ecological utopia where the tree is the main character! 


Gilbert COCHET,

Associate professor of life and earth sciences, naturalist and photographer, Gilbert has traveled France, Europe and the world for more than twenty years in search of the best preserved wild ecosystems. He collaborates on a daily basis in his research work with his wife Béatrice Kremer-Cochet.

He is attached to the National Museum of Natural History, expert at the Council of Europe, president of the Scientific Council of the "Gorges de l'Ardèche" nature reserve.

In the "Wild Worlds" collection, he published with Stéphane Durand "Réensauvageons la France" (2018) and with Béatrice Kremer-Cochet, "Europe réenauvagée, vers un nouveau monde" France (2020).

He is also the author of "Rivers and wild rivers over the natural reserves of France" (Delachaux and Niestlé, 2010) and "Le Grand-Duc d'Europe" (Delachaux and Niestlé, 2006).

He is involved in the association "Wild Forests".

MA Cohendet.jpg

Marie-Anne COHENDET,

Marie-Anne Cohendet is a professor of public law at the Sorbonne Law School. She directed the public law department of the Doctoral School of Law at the Sorbonne and currently co-directs masters 1 and 2 in environmental law. She is the author and co-author of numerous books and articles on constitutional law and environmental law, including: Constitutional law on the environment, Ecological democracy. An undisciplined thought, The deliberative Citizen Initiative Referendum, ...

Alix COSQUER.jpg


Researcher in environmental psychology at the Center for Functional and Evolutionary Ecology (CEFE, Montpellier).

His research focuses on the study of the relationship of individuals to nature, with regard to contemporary environmental and social issues. Her research work questions the representations, behaviors and evolution of human/nature relations through experiences in the territories of life. She is particularly interested in two main areas of research in relation to nature: education and health/wellness.

She is also interested in the interdisciplinary dialogue between the human and social sciences and the natural sciences.

She is the author of several books including: La sylvothérapie, 40 activities in town, 40 100% natural experiences...

Herve Coves.jpg


Agricultural engineer, Franciscan monk and great supporter of permaculture, he is passionate about living things, bacteria, plants, fungi and animals as well as the relationships that unite them. At the head of a research service for the Corrèze Chamber of Agriculture, he notably manages the experimental truffle of Chartrier-Ferrière.

  His maxim: "Life is beautiful".

Eric Fabre.jpg


Journalist by training. With a degree in literature and a master's degree in history, he is a graduate of CESA HEC. He was regional councilor for Limousin and also created several cultural associations (Eymoutiers-Culture-et-Mécénat, Les Amis du Théâtre de la Passerelle, Compagnie Corde Verte), before founding in February 2019 with Francis Hallé, the Francis Hallé association for the primary forest.


After long studies and a successful career in new technologies in Paris, Cécile feels the urgency of  “something else”. She leaves her comfortable life to go in search of a fairer life. She walks for a long time, alone, in nature, where she lives her first experiences of Connection, carries out alternative projects, then the synchronicities bring her to British Columbia. The global vision and the experiences she discovers at the Wolf school are so strong that she decides to make a film of it, "The Other Connection, a school in the wilderness". This school, based on indigenous cultures, is one of the most successful in the world in terms of the time spent by children in nature. Its purpose is to repair culture through mentorship and community, with nature being the teacher. "It takes a whole village to raise a child."

Chrystele FERJOU,

Departmental educational advisor, Crystèle is also coordinator of the departmental group "Classe Dehors" in Deux-Sèvres (79). A practitioner of the outdoor class since 2010, she provides numerous training courses on the subject. Co-author of the book "Take the children outside!" published by Robert Laffont in 2020 and author of the educational book "Once upon a time... the class outside!" published by Hachette Education in 2022.

In January 2022, she took over the co-management of the family organic farm in dual activity.

Patrick Fouvy,

Director of the Landscape and Forest Service Canton of Geneva - Cantonal Office for Agriculture and Nature.

Gabriel GABRIEL,

Gabriel Gabriel studied Yoga, Āyurveda and the different branches of Indian philosophy with Sri TK Sribhashyam, in France and India. He is involved in the training of teachers at the Yogakshemam school, where he notably teaches the application of Āyurveda to Yoga.

His latest book devoted to Āyurveda (in the process of being published), also gives an important place to trees; not only tree medicine (Vrikshāyurveda) but also how trees enable human beings to heal from their illnesses.

Francis HALLÉ,

Botanist and biologist, Francis Hallé graduated from the Sorbonne and the University of Abidjan. Professor of botany at the University of Montpellier, he specialized in the study of trees and tropical rainforests.

Among his works, the series of scientific missions he led from 1986 to 2003, called "The Raft of the Peaks" is remarkable. Thanks to an innovative light platform installed above the tree tops of the primary forests, he and his team were able to observe the forest, the trees from above, at the level of the canopy in an original way and thus discover a plant biodiversity and extraordinary animal still unknown, in Guyana, Gabon, Madagascar and Panama. Based on an original idea by Francis Hallé, the filmmaker Luc Jacquet made a film in 2013 on threatened tropical forests: “Once upon a forest”.

He has written many books including: plant praise, The Raft of the Peaks, Plant Architecture, Advocacy for the tree, The Origins of Plants, The Tropical Condition, Good use of trees, A garden after the rain, ... and a few films including "There was a forest"...

Olivier HAMANT,

Olivier Hamant is a biologist, research director at INRAE, within the Ecole Normale Supérieure in Lyon. He has published over a hundred scientific papers on plant biophysics and development, showing in particular how plants use forces to perceive their own form. This research topic also raises the question of the robustness and resilience of living organisms from a new angle. Nourished by this fundamental research, and in his function as director of the Michel Serres Institute, he contributes to several projects in the fields of art, science and education around the existential issues of the Anthropocene. The question of biological resilience comes in particular to feed a reflection on the lessons to be learned from the living to inhabit the Earth.


Benoit Hartenstein,

Benoît HARTENSTEIN is a notary in METZERVISSE (Moselle), Founder of the association "La Voix de l'Arbre", Member of a national multidisciplinary reflection group supported by the CAUE (Council of Architecture, Urbanism and Environment ) of Seine et Marne and by the ARBRES association (Arbres Remarquables:  Assessment, Research, Study and Safeguarding) whose objective is to formulate proposals for improving the legislation protecting trees, excluding forest, Co-correspondent Moselle for the association ARBRES, Working   for the recognition, in the long term, of the Rights of Nature.

Quentin HIERNAUX.png


Philosopher of science, FNRS Qualified Researcher, lecturer at the ULB, he is part of the Applied Ethics Research Group of the Philosophy Research Center (PHI) of the ULB. He is also a scientific collaborator at the Botanical Garden Meise.
He is interested in a little-studied theme: the philosophy of plants. It addresses the philosophical and ethical questions raised by plants as well as the status of plants in the history of science and in the history of philosophy.

Quentin Hiernaux is also coordinator of the "Innoviris Doubt my sciences" project, which promotes the scientific culture of young people aged 16 to 18 through epistemology workshops organized in schools..

Alice Khelifa portrait.JPG


Alice Khelifa is in charge of communication, documentary and pedagogy at the Zoein Foundation. After 12 years as a journalist, Alice Khelifa wanted to engage more concretely in the ecological transition by joining "Zoein Foundation", and by co-founding the association "For My Planet", which gives young people the means to take action to restore their connection to nature and to each other.

Claude Lefebvre.jpg


Teacher at the Lyonnaise School of Medicinal Plants, researcher, lecturer for over twenty years.

Graduated in physics and mathematics.

Author of the book "The Book of Plants, initiation to plant wisdom".

Initiator of the Forum and co-founder of the ASET Association.

Laure OBERLI1.jpg


Anthropologist and forest engineer, forest planner for the canton of Neuchâtel and teacher in a professional school for the training of foresters. At the same time, she is involved in communication, the transmission of knowledge and respect for Nature. Its flagship project, entitled "l'Arbre-lien", aims to promote the respect and preservation of very old trees as well as the recognition of the various values (spiritual, aesthetic, cultural, etc.) that can be attributed to the plant world. When she's not visiting old trees, she enjoys the company of the "elders" of the human world. Passionate about ancestral knowledge, she seeks to acquire precious know-how (and interpersonal skills!) from the guardians of our societies, before they take these precious heritages with them.

Kim PASCHE.jpg


Experimental archaeologist, trapper, author, Kim sees himself above all as a guardian of ancestral knowledge. He lives between Europe and the Yukon, in northwestern Canada, where he owns a concession isolated from the modern world. There, he seeks to unlearn a little from our modern world to make way for a more subtle approach to our environment. He works with the First Nations of the Yukon to imagine a way to preserve the values of which they are guardians.

In 2009, Kim and Philippe Verley founded the group people of the woods offering internships in nature.

Active member of the "Practical School of Nature and Knowledge", he has written several books, including, Arts of Wildlife, first gestures, his wildlife diaries: The Place of the World, in search of our wild origins. He held the column "Au fond des bois"  in the magazine Yggdrasil.  Since 2020, he has been co-editor-in-chief of the journal "The Living Tribe".

MM ROBIN Madagascar.jpg

Marie-Monique ROBIN,

Marie-Monique was born in 1960 on a farm in Poitou. After studying in Germany, she graduated from the University Center for Journalism Education (CUEJ). She began her career at the Capa agency, for which she directed numerous investigative documentaries. In 2011, she set up a civic production company with her family. In 38 years, Marie-Monique has produced more than 200 reports and documentaries. A dozen of them are associated with books. Winner of around thirty international prizes, she received the Albert-Londres prize in 1995, then in 2009 the Rachel Carson prize in Norway. In 2016, she received the Christophe de Ponfilly prize from the SCAM for her entire body of work.

Among his documentaries and books:

Philippe ROCH.jpg

Philippe ROCH,

Philippe Roch is Dr in biochemistry. Committed very early to the protection of nature and the environment, he was Secretary of State and Director of the Federal Office for the Environment, Forests and Landscape from 1992 to 2005.

At the international level, Philippe Roch has represented Switzerland in environmental negotiations. Member and twice co-chair of the Board of Trustees of the Global Environment Facility (GEF/GEF), he served on the Board of Trustees of the United Nations Institute for Training and Research (UNITAR) . He was also President of the Conference of the Parties to the Basel Convention (1999-2002) and the Rotterdam Convention (2004-2005). Member of the Ethics and Deontology Committee of the University of Geneva Philippe Roch currently works as an independent consultant in the field of the environment. He is dedicated to research, writing and communication on ecological, philosophical and spiritual issues. In 2008, he received an honorary doctorate in geosciences and environment from the University of Lausanne "for his contribution to environmental awareness and the development of knowledge in this field in Switzerland and abroad, for his humanity and his enlightened nonconformity".

Lia Rosso0223.jpg


Her interest in science is above all marked by its impact on daily life, as well as in existence. Doctor in cellular and molecular biology from the University of Nice Sophia-Antipolis and Milan, she then worked at the University of Lausanne as a researcher.

In 2010, she became a freelance journalist and, as she likes to say herself, a scientific “discloser”. She also gives conferences and courses for the general public on topics related to biology. After creating the publishing house Rosso Éditions in 2014, she published her first scientific novel, "Le Pituicyte", a year later. In 2019, she published "La Nature Sauvage en Nous" with Éditions Slaktine, a scientific "disclosure" text supported in part by the Association of Swiss Science Journalists and the Swiss Academy of Sciences.

In parallel to her scientific dissemination activities, she currently works at the State of Fribourg as a scientific collaborator.

Melila Saucy.jpg

Melila SAUCY,

Mélila discovers the layered forest during an internship in the Leberberg forest sorting, near Solothurn. After a bachelor's degree in forestry sciences at the Bernese University of Applied Sciences (UAS) HAFL in Zollikofen, she returned to Leberberg as an assistant triage forester. Since then, she has been involved in promoting gentle and close-to-nature management of the Leberberg forests, part of which has been listed as a UNESCO World Natural Heritage Site since 2021.

Jean-Pierre Sorg-2-26.03.2021.JPG

Jean-Pierre SORG,

ETH Forest Engineer, Dr. sc. nat., Assistant to the chair of silviculture at the ETHZ 1970-1977, further training in silviculture, forest vegetation and phytosociology, doctoral thesis in natural sciences on a topic relating to the management of mountain spruce forests.

Specialization in tropical forestry (reforestation, preservation and management of natural mountain forests and dense dry forests, agroforestry, village forestry, applied research for development).

Scientific collaborator and head of the Forestry for Development Group (GFD) in the Department of Environmental Sciences at ETHZ (1986-2011). Teaching in international forestry and agroforestry. Research topics: participatory forest management, human-forest interface, agroforestry, non-timber forest products, management of forest landscapes. Numerous publications and work reports.

Editor of the Swiss Forest Journal (2002-2007) and amateur botanist.

Member of the central committee of Pro Natura Switzerland (1996-2018), vice-president (2010-2018) and also various natural science societies and development cooperation associations.

Honorary member of Pro Natura (2018) and Doctor honoris causa of the Forestry University of Sofia, Bulgaria (2005).



Philosopher and economist, woman of action worried about the collapse of life, Sophie SWATON founded the "Zoein Foundation" in 2017. Lecturer and researcher at the Faculty of Geosciences of the University of Lausanne, specialist in transition issues including economics and spiritualities, she conceptualized the Ecological Transition Income, which is currently being tested. Sophie SWATON also co-directs the Ecology in question and Nouvelles Terres collections at the Presses Universitaires de France.

Odile Tacchi 17 03 2023.JPG

Odile TACCHI, Sponsor of the Second International Tree Forum

From 1983 to 2004, on foot and backpack, Jean-Pierre and Odile Tacchi repeatedly explored the rainforest of western Canada, which covers the mountains bordering the Pacific in British Columbia, one of the last major primary forests on the planet.

The work “ In the Western Canadian Rainforest », a real plea for the preservation of this forest, gives us a unique and edifying, sometimes poignant testimony, on this ultimate refuge for wildlife. “Only in the midst of nature free from any trace of human occupation, in total solitude, we can express the feeling of the sublime", according to the author, Jean-Pierre Tacchi.

An engineer whose professional career took place between IGN and CNRS, Jean-Pierre (1940-2018) showed an insatiable taste for wide open spaces from adolescence. Lifelong diarist, through his work, he makes us live, day by day and over the years, a great adventure in the heart of the temperate rain forest of British Columbia.

Odile, his wife and traveling companion, will give us her testimony while alerting us to the too short-term disappearance of one of the last great wild forests on the planet: a world of giants, lush vegetation, centuries-old trees, among tallest in the world...



Kindergarten teacher in Finland. She is one of the pioneers of Nature school in Finland and started her own Nature kindergarten in the early 2000s, with great success. She has trained many Finnish and foreign students in the nature area. She also helped to start a pre-school in the United States. She also works in the Nature area with her community in Järvenpää, Finland.



Activist, lawyer, founder and former president of the environmental NGO "Notre affaire à tous", coordinator of the Europe Ecology - Les Verts program for the European elections, Marie Toussaint was elected MEP on May 26, 2019.

She sits on the Industry and Research, Environment, and Legal Affairs committees, where she continues her fights for climate justice, the recognition and protection of the rights of living beings, and the recognition of ecocides; Thus that for justice for all: women's rights, young people's rights, rights of the most precarious.

In 2020, she founded the International Alliance of Parliamentarians for the Recognition of Ecocide.

Sarah WAUQUIEZ.jpg


Sarah Wauquiez is a primary teacher, psychologist and trainer of adults in pedagogy by nature. Since 1998, she has led playgroups, training and research programs on the benefits of nature for children. She is the author of the books "Children of the woods" (2008), "Open-air school" (2019) and "Future Skills - Fostering future skills outside" (to be published).

Marine YZQUIERDO.jpg


Marine Yzquierdo is a lawyer in environmental law and administrator of the association "Notre Affaire à Tous", which works for climate justice and the rights of living beings. She assists collectives and local elected officials who wish to deploy the rights of nature on their territory (Tavignanu, Têt, Garonne rivers, Parliament of the forest, etc.) and has edited the work "Les droits de la Nature - Toward a new paradigm for the protection of life”.

Ernst Zurcher.jpg

Ernst ZÜRCHER,Sponsor of the First and Second International Tree Forum,

World-renowned forest engineer, doctor of natural sciences, professor emeritus and researcher in wood sciences at the Bernese University of Applied Sciences, until recently lecturer at the Swiss Federal Institute of Technology Lausanne (EPFL), at the Swiss Federal Institute of Technology of Zurich (ETHZ) and at the University of Lausanne. He studies more particularly the temporal structures of trees (chronobiology). He is the author of numerous scientific articles and the general public book "Les Arbres entre visible et invisible" published by Acte Sud and several other works: "Planting a tree and creating a forest", "Listening to the Forest". ...

He is also at the center or at the origin of several documentaries and films.

bottom of page