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The Secretariat

A Secretariat composed of academic experts and professional diplomats supports the Commission. The Secretariat is hosted by the Paris Peace Forum, an international civil society organisation committed to improve global governance. 

Jesse Reynolds

Executive Secretary

Jesse Reynolds, PhD

Dr. Reynolds has worked at the intersection of environment, technology, and policy for more than two decades. He is the author of The Governance of Solar Geoengineering: Managing Climate Change in the Anthropocene (Cambridge University Press). Prior to his position at the Climate Overshoot Commission, Dr. Reynolds was an Emmett / Frankel Fellow in Environmental Law and Policy at the University of California, Los Angeles School of Law. He has degrees from Tilburg University, The Netherlands; the University of California, Berkeley; and Hampshire College.

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Director of External Relations

Khalid Tinasti, PhD

Khalid Tinasti is also a research associate at the CCDP at the Geneva Graduate Institute, a Visiting Fellow at the International Center on Drug Policy Studies at Shanghai University, and taught international drug policy as a Visiting Lecturer at the Geneva Graduate Institute (2021-2022). He is the former Director of the Global Commission on Drug Policy, and worked as an independent consultant for IOs and as a Press and Communications Officer in the office of the Minister of Urban Cohesion (ministre de la Ville) in France.

Sophia La Marca

Operations Coordinator

Sophia Luisa La Marca, M.Sc, LL.M

Sophia La Marca is a young professional with experience in project management. She worked among other things for Operndorf Afrika, a project  by Christoph Schlingensief supporting cultural exchange between Africa and Europe. With a specialization in security studies, she holds a Master of Laws from Vrije Universiteit Amsterdam, and a Master of Science from Universidad Pompeu Fabra in Barcelona. She was invited to the Europeaum Spring School at University of Oxford as part of her research on EU mediation efforts.

Adrien Abecassis

Principal and Special Advisor to the co-chair

Adrien Abécassis

Adrien Abécassis is a career diplomat, a former senior advisor to the French President, and currently the Chief Policy Officer of the Paris Peace Forum where he leads the team dedicated to incubating and running wide-ranging initiatives strengthening the governance of global commons. He has worked for 15 years in international policy, science and technology policy, and global governance. He was an Emmett Fellow in Environmental Law and Policy at UCLA and an International Affairs Fellow at Harvard University.

Joshua Horton

Research Director

Joshua Horton, PhD

Dr. Horton is the senior program fellow for solar geoengineering at the Mossavar-Rahmani Center for Business and Government at the John F. Kennedy School of Government, Harvard University. He conducts research on solar geoengineering policy and other aspects of global climate governance. He previously worked as a clean energy consultant for a global energy consulting firm. Dr. Horton holds a PhD in political science from Johns Hopkins University and was a postdoctoral research fellow at Harvard Kennedy School’s Belfer Center.


The Climate Overshoot Commission is supported by:

// Open Philanthropy

// Cohler Charitable Fund

// LAD Climate Fund

The Rockefeller Foundation supported the Commission's first meeting.

Trees From Above


A few individuals provide advice to the Secretariat on an ad hoc basis.

David Keith, Gordon McKay Professor of Applied Physics, Harvard John A. Paulson School of Engineering and Applied Sciences and Professor of Public Policy, Harvard Kennedy School, Harvard University, US/Canada

Edward A. Parson, Dan and Rae Emmett Professor of Environmental Law and Faculty Director, Emmett Institute on Climate Change and the Environment, University of California, Los Angeles US/Canada


The Climate Overshoot Commission is the result of a high-level process that explored the necessary conditions for a robust and science-based global dialogue on governance gaps relating to response options to climate change beyond emissions reductions. Initial discussions supported by the Paris Peace Forum, UCLA, and Harvard University led to the creation of a Steering Committee. It consisted of diverse experts, policymakers, and civil society leaders from the global North and global South, including a vice-chair of the Intergovernmental Panel on Climate Change, a former president of the Marshall Islands, and officials associated with the 2022 UN climate change conference. The Steering Committee considered how to address these gaps and to build shared understanding regarding the novel governance challenges. After more than a year of deliberations, the Steering Committee suggested the formation of a Global Commission on Governing Risks from Climate Overshoot.


The Commission and its Secretariat were formed in early 2022.

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