About Coral Guardian



In 2010, Martin Colognoli and Guillaume Holzer created Coral Guardian, french based non-profit recognized of public interest in order to take advantage of their skills and experiences to benefit the environment.


Coral Guardian aims to promote innovative approaches to marine conservation and encourage sustainable patterns of development by deploying a wide scope of actions.


To do so, we develop realistic and optimistic solutions through joint programs that adress to everyone: local communities, general public, youth, businesses and communities.


We commit to the preservation of marine ecosystems through its four areas of intervention by seamlessly combining marine conservation, enhancement of biodiversity and sustainable development to improve the participation of local communities in accelerating development mechanisms of sustainable development in order to improve their livelihoods.


Coral Guardian developped a social-ecological approach to marine conservation based on fundamental needs and universal declaration of human rights (art. 22, 25 and 27) “All peoples have the right of self-determination. By virtue of that right they freely determine their political status and freely pursue their economic, social and cultural development […] All peoples may freely dispose of their wealth and natural resources […] In no case may a people be deprived of its own means of subsistence”.

Coral Guardian vision EN



Restoring and preserving coral reef ecosystems.

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Empowering local communities and the general public.

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Develop research programs to understand and valuate coral reef ecosystems.

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Develop sustainable solutions to improve the livelihoods of local communities.

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    Restorate a coral reef restoration involving the local community that depends on it


    Protect and manage the restored zone


    Awareness and skills transfer programs


    Develop valuation tools for tourism, fisheries, biotechnologies, etc.


    Autonomous program management by local stakeholders

logo coral guardian team


We are a team of professionals and scientists with complementary skills who share a passion for marine environments. We are all united in a common goal of conservation and reducing the human impact on these endangered ecosystems.


  • Martin Colognoli
    Martin ColognoliPresident & Co-founder

    Engineer in Aquaculture and Marine Ecology. Formerly manager of a coral farm in Indonesia for the aquarium trade. Many research and coordination projects in several countries where the scientific communities are specialists in coral reefs. Knowledge of the problems on the ground. Currently coordinating regeneration projects of marine ecosystems and coral culture engaging many stakeholders. Always looking for new ideas and innovative processes.

  • Guillaume Holzer
    Guillaume HolzerVice-President & Co-founder

    Master of Marketing and communication carried out abroad, then marketing consultant and project development manager in tourism. Strategy consulting experience to develop innovative and sustainable solutions to create sustainable added value. Communication skills to projects related to marine environments. Good knowledge of the current state of the marine environment and its operation. Coordinates the communication strategy of each project while actively participating in situ programs.


The Board of Directors is composed of three persons: Maxime Beraud, Martin Colognoli and Guillaume Holzer.


Our work and commitment is supported by our scientific committee of international experts in marine conservation and biodiversity studies.

  • Dr Jane Williamson – PhD/Teacher – Founder of Marine Ecology Group – McQuarie University – Australia
  • Dr Devarajen Vaitilingon – PhD – Director of Biosys Consulting – Australia
  • Jérome Mourin – Curator/Cosnervation Director of Aquarium Grand Lyon – France
  • Grégoire Bastide – Director of Luxaqua – France
  • Guillaume Pujol – Director of Marinehome – France
  • Thomas Miard – Research Manager at Institut Océanographique Paul Ricard – France


  • Solomon Viitasaari
    Solomon ViitasaariProject Coordinator
    • Wayan Patut
      Wayan PatutLocal Relations Manager
      • Maxime Beraud
        Maxime BeraudMarine Biologist
        • Julien Holeville
          Julien HolevilleReef structure Engineer


          • Florence Trunz
            Florence TrunzAwareness Program Coordinator
            • Sandrine Heredia
              Sandrine HerediaEnglish Teacher
              • Meliza S. Woribai
                Meliza S. WoribaiEnglish Teacher
                • Revina Indra Putri
                  Revina Indra PutriEnglish Teacher
                  • Vladimir Ospina
                    Vladimir OspinaArchitect - Designer

                    RESEARCH POLE

                    • Leïla Ezzat
                      Leïla EzzatDoctorante en Ecophysiologie
                      • Jérémy Berthelier
                        Jérémy BerthelierMarine Biology Post Grad Student
                        • Maxime Beraud
                          Maxime BeraudMarine Biologist
                          • Dr. Olivier Detournay
                            Dr. Olivier DetournayMarine Immunologist

                            MANAGEMENT POLE

                            • Guillaume Angelvy
                              Guillaume AngelvyAccountant
                              • Émilie Hamon
                                Émilie HamonHR Manager
                                • Éléonore Kubik
                                  Éléonore KubikEnvironnemental Law
                                  • Jérémy Casteuble
                                    Jérémy CasteubleSustainable Development

                                    EXTERNAL RELATIONS POLE

                                    • Jessy Mione
                                      Jessy MionePR
                                      • Sarah Stiffel
                                        Sarah StiffelBiology PhD Student
                                        • Olivier Ferry
                                          Olivier FerryExternal Relations
                                          • Bruno Breton
                                            Bruno BretonExternal Relations

                                            KARYA SEGARA

                                            logo karya segara

                                            Kelompok Nelayan Pesisir Karya Segara (Coastal Fishermen Group Worker of the Sea) is a cooperative of Serangan village.

                                            We are working with them to make conservation actions a success. They are the first suffering from climate change impacts and environmental issues.

                                            Karya Segara was formed by and for the village of Serangan in order to improve community participation in accelerating the development of marine fisheries by coastal and marine environmental protection in order to improve sustainable livelihoods.

                                            The main purpose of our partnership with Karya Segara is to increase the awareness, knowledge and skills of the community to be able to manage marine and coastal resources through conservation and marine tourism in the aim to increase the value of the economic and social welfare in a sustainable manner for the future generations.

                                            En savoir plus
                                            karya segara team bali coral guardian
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