Our people Your partners.

All EcoActers are driven by a shared purpose to make a difference. To help businesses to implement positive change in response to climate and carbon challenges, whilst also driving commercial performance.

100 climate experts

More than 100 experts addressing all climate, carbon and energy challenges.

Global Team

An international network of EcoActors across five countries: France, UK, Spain, USA & Kenya.

Unique Skills

Each team member brings a unique set of skills and expertise in their specialist areas.

Proven Record

Over 10 years we have worked to clients across all areas of industry to assist them in their climate ambitions and support positive change.

Who we are

These are some of the values and expertise that define our EcoActors

Passion for the environment

At EcoAct we are a diverse bunch of people all driven by the same purpose to tackle the world's environmental challenges. It might be our job but it is also our personal passion.

A unique culture

At EcoAct we believe environment and employee well-being are key to sustainability. We deal with serious challenges in our day to day work life but it doesn't stop us having fun.

Extensive expertise

Our knowledge spans the complex field of sustainability. Our teams include data analysts, strategy experts, energy management experts, compliance wizards and project developers out in the field.

Global partnerships

EcoAct has grown out of our successful global partnerships. For us collaboration is the key to success in tackling climate change and other environmental challenges. This is what we excel at.

Your EcoAct experts.

Gérald Maradan

Co-Founder & CEO

A recognized expert in climate and carbon strategies for businesses and territories, Gérald co-founded EcoAct in 2005.

Physicist and engineer by training (he holds an engineering degree from INPG – Grenoble Institute of Technology – and a MRes in Physics from INP Toulouse), he also holds an MBA from HEC, Paris.

He has coordinated more than 100 consulting missions and participated in the development of more than 25 carbon offset programs (biomass, wind, methanisation, hydropower, heat recovery, energy efficiency, REDD +). Gérald also worked at STMicroelectronics, a world leader in new technologies. Responsible for the development of environmental programs, he participated in 1996 in the first large scale global carbon neutral experiment. He has since conduct many groups in the implementation of their carbon neutral policy.

A member of Finance for Tomorrow, Chairman of ICROA (International Carbon Reduction and Offset Alliance), Gerald regularly speaks at international climate conferences.

Gérald is also the co-founder of the NGO Entrepreneurs for life, which supports innovative social entrepreneurs with the aim of reducing poverty.

Thierry Fornas

Co-Founder & President

Co-founder and President of EcoAct, Thierry brings his climate and carbon strategy expertise to businesses and territories for more than 12 years.

Graduated from the HEC MBA and ESIEE Paris engineer, Thierry created EcoAct in 2005, after a career at Schlumberger Industries and STMicroelectronics. In this context, he participated in 1996 in the first major carbon neutrality operation. Since then, he has led more than 200 climate and carbon strategy consulting assignments on behalf of businesses and communities.

Thierry is a founding member of APCC (Association of Professionals in Carbon Consulting) and President of Climate Pal, an organization that develops low carbon projects in East Africa, including improved cookstoves and agroforestry projects.

Sylvianne Villaudière

Associate Director of EcoAct; Founding Director of Alliantis

Sylvianne is a recognized expert in alliance strategies and CSR-climate communication for companies and territories.

Graduated from the Paris Institute of Political Studies, Sylvianne Villaudière began her career in 1985 in consulting firms in corporate communication (Bernard Krief Consultants, Tilder Associates) and was Managing Director of EuroPanorama (Forum des regions d ‘Europe).

Since 2000, she has founded and directs Alliantis, a consulting and support force specializing in alliances strategy and CSR-SDG communication, with executives of companies and organizations carrying a project of general interest. Since the merger of EcoAct and Alliantis in February 2017, she is also Associate Director of EcoAct.

A committed woman, Sylvianne was general coordinator of “COP21 Solutions” at the Grand Palais in Paris in 2015, and coordinator of COP22 Enterprises in Morocco in 2016. She also has experience in associative functions: General Delegate of the College of Directors of the Sustainable Development (C3D), Member of the Steering Committee of the Club France Sustainable Development, Member of the Board of Directors of Women, Debate and Society (FDS), President of the Communication and Training Committee of the Society for the Promotion of the National Industry.

Mark Chadwick

CEO, EcoAct UK

Mark founded Carbon Clear after a career in the Internet industry. After the birth of his daughter, Mark decided to invest himself full-time into helping to leave a better world for her generation. Carbon Clear flourished and has now merged with EcoAct. He brings to the company a passion for contributing to the climate change solution, strong business management experience, and an enthusiasm for growing successful entrepreneurial ventures. Mark has an MBA from London Business School and also won the Guardian Unltd Award for social entrepreneurship.

Cristina Raventós

Principal Consultant & Manager of EcoAct Spain

Cristina works with leading IBEX 35 and FTSE 100 businesses to develop their sustainability strategies and accounting tools. She has seven years of sustainability consulting experience with EcoAct, working with various international organisations to help define, manage and implement business solutions. Cristina has experience working in a wide range of sectors including utilities, financial and consumer services. She is a qualified Industrial Engineer from the Polytechnic University of Catalonia and holds a first-class MSc Environmental Management for Business from Cranfield University. She is GRI certified and speaks Spanish, Catalan and English. Cristina manages EcoAct in Spain and has considerable experience in ensuring large multi-site projects are executed effectively and efficiently, within client timescales and within allocated budgets. Cristina’s role in this project will be to oversee the implementation of EcoAct’s tasks and deliverables in meeting the project needs.

William Theisen

Managing Director, EcoAct North America

CEO of EcoAct – USA, William has 10 years of experience in finance and development of low-carbon projects.

A graduate of Boston University and an MBA from HEC Paris, William began his career with the Gold Standard Foundation. He then worked for the NGOs Nexus and GERES (Renewable Energies, Environment and Solidarity Group) where he participated in the development of a dozen low-carbon projects in Africa and Asia, thanks to carbon finance and crowd-funding.. As Director of Business Development and Nexus Partnerships, William has also established partnerships between these projects and numerous international companies: Deutsche Post DHL, Coca-Cola, Veolia Water.

In collaboration with Yale University, William conducted research on risk assessment and opportunities for the development of improved cookstove projects, through carbon finance, in West Africa.

William is also a member of the Executive Committee of the International Carbon Reduction and Offset Alliance (ICROA).

Rachel Hunter

Director of Marketing and Communications

Rachel has over ten years of experience working in marketing, communications and public relations in the finance, energy and environment and charity sectors. Rachel’s skill set lies in developing strategy based on client requirements and communicating accessible and interesting content across a range of digital, broadcast and print channels. She also has extensive experience in managing events and PR and media work. Rachel holds a BA Hons in International Studies and French from the University of Birmingham and a Professional Diploma from the Chartered Institute of Marketers

Stuart Lemmon

Managing Director

Stuart joined EcoAct UK (then Carbon Clear) in 2012 bringing over 17 years’ experience in Environmental Consultancy. His career includes a range of operational roles in environmental management, sustainability and risk disciplines. Stuart has experience of working in a wide range of both private and public sectors including property, construction, financial services, process industry, utilities, oil & gas and central and local government.

Stuart has a BSc (Hons) in Environmental Sciences and an MBA. He provides technical direction and project management support across EcoAct’s consulting projects. His projects include large multi-site audit and data collation exercises, system development and implementation and target setting and performance monitoring across multi stakeholder organisations.

Meinrad Bürer

Director, Research and Development

R & D Director at EcoAct, Meinrad has more than 15 years of experience in climate issues, energy sector, community resilience, and certification tools and standards applied to the evaluation of development contributions particularly in the context of the carbon market.

A graduate of the Ecole Polytechnique Fédérale de Lausanne (EPFL) and a PhD in Energy Systems Modeling and Optimization, Meinrad has held strategic consulting positions in the private sector and held senior positions in the private sector. ‘non-governmental organizations. He has served as Technical Director of the Gold Standard Foundation, and Senior Administrator in charge of climate issues at the International Federation of Red Cross and Red Crescent Societies (IFRC). He has also conducted research activities in the field of energy transition at EPFL, the Lawrence Berkeley National Laboratory and more recently at the Institute of Environmental Sciences of the University of Geneva. Meinrad is currently a member of the Board of Directors of Gold Standard, where he also chairs the Technical Governance Committee.

At EcoAct, Meinrad oversees technology watch and innovation strategy for the development and launch of new products and services in France and internationally.

Arnaud Doré

Managing Director, EcoAct South Europe

Managing director of EcoAct, Arnaud has over 15 years of experience in climate strategy and sustainable development, project management and change management.

Engineer of the National Institute of Telecommunications, Arnaud also has a Master in International Business Management and is qualified Bilan Carbone®. Arnaud has worked for more than 8 years on strategy missions, customer relations, operational performance (purchasing, IT, HR …), development of IT tools and infrastructure deployment in the ICT sector (Bouygues Telecom , Spie). He also participated in the development of embedded systems for the collection, centralization, and analysis of data from communicating devices (smart meters) for the implementation of a device for real-time monitoring of consumption (energy, gas). , water …). Within EcoAct, Arnaud has led the realization of more than 100 climate-carbon consulting missions (climate plan, carbon neutrality strategy, SBT, internal carbon price, project development …) for actors in various sectors. (City of Paris, ADEME, Ministries, La Poste Group, ATOS, Total …)

Words of wisdom from the CEO

CEO of EcoAct, UK (formerly Carbon Clear), Mark Chadwick provides his thoughts on what climate change really means to businesses.