The ISC’s headquarters is based in Paris (21 staff) and ensures the day-to-day planning and operations under the guidance of the elected Governing Board. The ISC has three Regional Offices—serving Africa, Asia and the Pacific, and Latin America and the Caribbean—with their own secretariat that is staffed locally.

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Heide Hackmann

Chief Executive Officer

Dr. Heide Hackmann is the CEO of the International Science Council, having previously been the Executive Director of the International Council for Science (ICSU) since March 2015. Before joining ICSU, Heide served eight years as Executive Director of the International Social Science Council (ISSC). Heide holds a M.Phil in contemporary social theory from the University of Cambridge, UK, and a PhD in science and technology studies from the University of Twente in the Netherlands. She has worked as a science policy maker, researcher and consultant in the Netherlands, Germany, the United Kingdom and South Africa. Before moving into the world of the international councils, Heide worked as Head of the Department of International Relations and Quality Assessment of the Royal Netherlands Academy of Arts and Sciences. Her career in science policy dates back to the early 1990s when she worked at the Human Sciences Research Council in South Africa. Heide holds membership of several international advisory committees and boards, including the Scientific Advisory Board of the Potsdam Institute for Climate Impact Research in Germany and the Board of the Stockholm Resilience Centre in Sweden. She co-chairs the UN’s 10-member group supporting the Technology Facilitation Mechanism (TFM) on the Sustainable Development Goals, and is a member of the World Economic Forum’s Global Future Councils.

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Mathieu Denis

Science Director

Mathieu was appointed Science Director of the ISC in July 2018, having previously served as Executive Director of the International Social Science Council since November 2015. Mathieu holds a PhD from the Humboldt University in Berlin, Germany. He has previously taught history, political theory and industrial relations at Université du Québec à Montréal, and Université de Montréal. Mathieu Denis was a post-doctoral researcher on the 2010 World Social Science Report on Knowledge Divides, and later joined the ISSC in 2012 as Science Officer. Prior to joining the ISSC, Mathieu Denis worked as researcher at the Berlin Social Science Centre and the Canadian Centre for German and European Studies.

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Charles Erkelens

Operations Director

Charles holds Master’s degrees in History and in Law, both from the University of Leiden, the Netherlands, as well as an MBA from the Rotterdam School of Management. Before joining the International Council for Science, Charles has been a consultant in the field of Social Impact and Impact Measurement, set up and led an academic centre at the Erasmus University of Rotterdam on strategic philanthropy and has been Editorial Director of the Humanities department at academic publishing house Springer.

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Yun-Kang Ahn

IT Officer

After working as an IT consultant, Yun-Kang joined ICSU in 2012. After training in mathematics and physics, he holds degrees in computer science and applied science to music. These led him to a PhD in computational musicology, which were completed during his work experience with other research topics like image processing or video compression and streaming.

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Maureen Brennan

Administrative Officer

Maureen is originally from Dublin, Ireland. She has been working with ICSU since May 1986 as an Administrative Officer involved in, inter alia, membership and back-stopping several scientific committees by organising meetings and following yearly budgets for each Committee. Maureen was attracted to ICSU because of its vast global membership and its multi-interdisciplinary activities. Some spare time activities outside ICSU are collecting school books for schools in Benin and Uganda and visiting these schools.

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Mayette Geronimo

Financial Officer

Mayette studied in the Philippines and finished a degree in Business Economics in 1979. She worked for different companies in Accounting, Banking and Finance, before coming to Europe in 1989. She lived in Spain for over ten years, mostly working in the humanitarian sector. Mayette also worked with women and children in her church, in particular helping poor and homeless people to reintegrate into society. In 1998, her family was transferred to Paris and she started at the ISSC in 2001 as part-time secretary, and eventually took on a full-time permanent role as Finance and Administrative Officer.

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Alexandra Guennec

Human Resources Officer

Alexandra joined ICSU in late 2013 as Payroll and HR Administration Officer. She holds a degree in Human Resources. Before joining ICSU, she practiced her profession in working for several chartered accountants.

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Eric Leparmentier

General Services

Eric is in charge of general day-to-day maintenance and security at ISC, as well as of supplies and equipment.

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Arno de Marchi

Junior Administrative Officer

Arno had just finished his fourth year of studying comparative literature, when one day he woke up and realized that he needed to help save the world. Soon thereafter, he joined ICSU, where he assists Natacha and the whole staff with administrative tasks.

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Natacha de Marchi


Natacha manages ISC’s financial matters. She joined ICSU in 1997, after holding several positions in an oil company (BP), in a leading marketing information company (AC NIELSEN) and in Chartered accountant (INFODIT).

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Alison Meston

Senior Communications Officer

Alison is originally from Australia and was appointed Senior Communications Officer in February 2019. Her role includes developing the ISC communications and outreach strategy, supporting membership engagement and working alongside colleagues on a wide range of ISC projects. Alison holds a Master’s of Arts in Public Policy and International Law from the American University of Paris and most recently, a Programme Certificate in Climate Change Management from the University of Edinburgh. Prior to joining the ISC, Alison worked in the Communication and Information sector at UNESCO, as Director of Press Freedom for the World Association of Newspapers and News Publishers and as a Public Affairs officer for the British Red Cross.

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Sarah Moore

Science Officer

Sarah manages the Transformations to Sustainability Programme, which aims to support transdisciplinary research on social transformation needs and opportunities in a context of global environmental change. She has a degree in English and German literature, and two Masters degrees – in Education Sciences and Science & Technology Studies. Before coming to the ISSC she was Science Officer for the Social Sciences at the European Science Foundation, coordinating international research programmes and strategic initiatives in the social sciences and managing the MERIL project (Mapping of the European Research Infrastructure Landscape).

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Katsia Paulavets

Science Officer

Katsia manages the research funding programme Leading Integrated Research for Agenda 2030 in Africa (LIRA 2030 Africa), which aims to increase the scientific contribution from Africa to the implementation of the Sustainable Development Goals and the New Urban Agenda. Katsia also coordinates scientific inputs from the ISC community into policy processes on climate change. Within the Council, Katsia also worked on increasing the involvement of scientists from developing countries in setting up Future Earth, the research agenda for global sustainability, and on fostering interlinkages between global and regional activities on disaster risk reduction. Before joining the Council, she worked for UNEP’s Division of Technology, Industry and Economics in Paris on building institutional capacities on emergency preparedness and chemical accident prevention, both at national and local levels. Prior to that, Katsia worked at Lund University in Sweden on the development and the implementation of the capacity-building programme “Energy for Sustainable Development”, designed for energy professionals in developing countries. Katsia holds Masters Degrees in environmental engineering, management and policy from Lund University and the Belarusian National Technical University.

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Anda Popovici

Junior Administrative Officer

Anda supports the Transformations to Sustainability Programme and the activities of the International Science Council (ISC). She holds two Masters Degrees from Sciences Po Strasbourg – in European and International Studies and in European Policies and Public Affairs. Before joining the ISC, she worked for the International Social Science Council, and at the European Parliament on topics related to the environment, public health and food safety.

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Lizzie Sayer

Communications Officer

Lizzie is Communications Officer at the ISC. She joined the ISC from the International Social Science Council (ISSC), where she managed the publication of the 2016 World Social Science Report. Between 2013 and 2015 she worked in the interim Secretariat of Future Earth based at the International Council for Science (ICSU). She has a degree in languages, and first joined ICSU from a role in communications at the University of Oxford. She has also worked in events management and public policy research, with a focus on food and agricultural policy in the UK and Europe.

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Vivi Stavrou

Senior Science Officer

Vivi is a Clinical Psychologist and development worker with extensive experience in humanitarian emergencies and post-conflict situations as an international social development consultant and independent evaluator and researcher. Her areas of work include child protection, HIV and AIDS, social protection systems, psychosocial programming, mental health and Human Rights, gender, security sector reform and public health programming.

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Anne-Sophie Stevance

Science Officer

Anne-Sophie manages the international science-policy activities related to the Sustainable Developments Goals, the post-2015 framework for Disaster Risk Reduction and the new climate agreement. Within these processes, Anne-Sophie coordinates inputs from the international scientific community and supports stronger interface between scientists and policy-makers. Anne-Sophie has also worked on the design and implementation of Future Earth, a new strategic framework for global Earth system research. She holds a Master degree in political sciences, specialising in sustainable development policies. Before joining the ISC (and ICSU), Anne-Sophie worked as an environmental project officer in a research consultancy and helped integrate engineering and scientific knowledge into local environmental policies. She also has experience in stakeholders’ management at local and European levels to support sustainability initiatives.

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Megha Sud

Science Officer

Megha joined ISC as Science Officer in 2019. She has previously worked as a policy analyst and programme officer at the OECD, the International Energy Agency and WWF. Her work has focussed on conducting interdisciplinary research and building networks to facilitate science-policy interface, with a particular interest in climate change, biodiversity and urban development. She holds a PhD in geography from the University of Cologne, an MA in development studies from the Tata Institute of Social Sciences, Mumbai and a BA in history from the University of Delhi.

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Zhenya Tsoy

Junior Digital Communications Officer

Zhenya joined the ISC in 2019 to support the communications team with everything digital. Born and raised in Central Asia, she later lived, studied, and worked in the US, the UK, and the Czech Republic, before permanently settling in France. Her expertise is in communications, with a focus on the non-profit/development sector.

Anne Thieme

Membership Liaison Officer

Anne took up the position as Membership Liaison Officer at the ISC in 2020 and acts as the main contact point for all ISC members and members-to-be. Prior to joining ISC, Anne coordinated a programme on endangered migratory birds of prey at the Convention on Migratory Species in Abu Dhabi (UNEP), managed the events department at the German Centre for Neurodegenerative Diseases, and oversaw membership operations and project management at IFOAM – Organics International. She holds a Master’s degree in Food Science and Technology from the Beuth University of Applied Sciences in Berlin and is particularly passionate about environmental science and conservation.

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Miia Ylöstalo-Joubert

Administrative Officer

Miia originally joined ICSU in 2013 to support the early implementation of Future Earth. In her current role, Miia supports the ISC executive management and the ISC Governing Board as well as the work of the Committee on Freedom and Responsibility of Science (CFRS). Her experience ranges from coordinating international programmes, projects and large-scale events to administering sales and customer relations for multinational corporations. She holds a MSc in Health Sciences.

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Committee on Freedom and Responsibility in Science (CFRS)

Roger Ridley

Executive Secretary (on secondment by and based at the Royal Society of New Zealand)

Roger took up the position of Executive Secretary to the Committee on Freedom and Responsibility in the Conduct of Science in July 2016. Roger’s day job is at the Royal Society of New Zealand leading a team that prepares and publishes advice to government and the public on important matters, and working with the research community to identify and encourage best practice in the research community. Roger has a research background in atmospheric sciences and numerical modelling followed by various senior roles in the public sector covering economics, science, policy, investment and innovation. Roger holds a B.Sc. (Hons 1st Class) in Physics from Otago University and a Ph.D. in Applied Mathematics from Monash University.