GHHIN Management Committee Members Selected to Author IPCC’s 7th Global Assessment
Published: August 27, 2025
The Intergovernmental Panel on Climate Change (IPCC) has appointed 664 scientists and experts from 111 countries to author its Seventh Assessment Report (AR7), the most comprehensive review of climate science in the world. Chosen from nearly 4,000 nominations, the new author team includes four members of the Global Heat Health Information Network (GHHIN) Management Committee.
The IPCC reports are considered the gold standard in climate science, assessing thousands of studies to inform global climate negotiations, national policies, and local action. Being selected as an IPCC author is an acknowledgement of scientific leadership and a commitment to years of collaborative work shaping the evidence base for climate decision-making.
Network experts contributing to AR7
Roxy Mathew Koll
Lead Author, Working Group I, Chapter 6: Global projections of Earth system responses across timescales
Roxy Koll is a Climate Scientist at the Indian Institute of Tropical Meteorology under India’s Ministry of Earth Sciences. He has made pioneering contributions to the understanding of monsoon floods and droughts, marine and terrestrial heatwaves, and cyclones across the Indo-Pacific. His research has advanced health early warning systems and climate modeling, enhancing food, water, and economic security for millions. He is also the former Chair of the Indian Ocean Region Panel and collaborates widely with citizen science groups, local governments, and media to connect science with society.
Ollie Jay
Lead Author, Working Group II, Chapter 9: Australasia
Ollie Jay is Director of the Heat and Health Research Centre at the University of Sydney. He has led influential projects shaping heatwave policies in Australia and abroad, including for Tennis Australia, Cricket Australia, and the National Rugby League. He also served as Lead Heat Consultant for the Australian Olympic Team at the Paris 2024 Games. In 2021, he co-led The Lancet’s first-ever Series on Heat and Health and co-founded EMU Systems, a venture delivering heat stress monitoring and management solutions for sport and industry.
Julie Arrighi
Lead Author, Working Group I, Chapter 10: Urban risks and climate services; contributing to the Cities report
Julie Arrighi is Director of Programmes at the Red Cross Red Crescent Climate Centre, where she leads the urban portfolio with a strong focus on heatwaves. She also coordinates climate adaptation efforts in conflict settings through the Centre’s partnership with the International Committee of the Red Cross. Holding a joint role with the American Red Cross, she provides climate risk management guidance to international programs. Her career has spanned disaster risk reduction projects across East and Southern Africa, and she holds a Master’s degree in Climate and Society from Columbia University.
Sari Kovats
Review Editor, Working Group II, Chapter 19: Health and Well-being
Sari Kovats is an Associate Professor at the London School of Hygiene and Tropical Medicine and a Fellow of the UK Faculty of Public Health. With more than two decades of experience in environmental epidemiology, she has led major studies on the impacts of heat on maternal and child health, and on climate change risk assessments. She has been a leading contributor to both national and international evaluations of the health impacts of climate change, with a focus on health inequalities.
Why this matters
The last IPCC assessment, published in 2021–22, warned that heat extremes are increasing in frequency, intensity, and duration, with severe consequences for human health, food security, and economic stability. The Seventh Assessment will build on that evidence and provide updated guidance for policymakers at a critical moment.
The inclusion of GHHIN experts and so many other cross-sectoral ensures that the intersection of heat, health, and human wellbeing will be at the forefront of global climate science and policy in the years ahead.