Coral Reef Restoration - Coral Guardian Team - Indonesia


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 ColognoliPrésident

    Engineer in Aquaculture and Marine Ecology. Formerly manager of a coral farm in Indonesia within an export and structure of marine animals for the aquarium. Numerous research missions and project coordination in several countries where the scientific communities are specialists on coral reefs. Knowledge of problems on the ground. Currently coordinates marine ecosystem regeneration projects and coral culture mobilizing many stakeholders. Always looking for new ideas and innovative processes.

  • Guillaume Holzer
    Guillaume HolzerVice-Président

    Mbus in marketing and communication carried out abroad. Formerly marketing consultant and project manager in tourism and specialist in strategy to develop innovative and sustainable solutions. Communication and project managment skills related to marine environments. Good knowledge of the current state of the marine environment and its functioning. Coordinates the development of the aorganisation and the management of projects while actively participating in field 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 AngelvyComptable - Trésorier
                              • Émilie Hamon
                                Émilie HamonHR Manager
                                • Laure Machon
                                  Laure MachonResponsable Développement et Droit Environnemental
                                  • Laura Beekmann
                                    Laura BeekmannChargée de Développement des Aires Marines Protégées et Droit Environnemental

                                    EXTERNAL RELATIONS POLE

                                    • Thibault Dentin
                                      Thibault DentinResponsable des Relations Institutionnelles
                                      • 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.

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                                              karya segara team bali coral guardian