- Socioeconomics lead for the GCAM core model development team
- Lead modeler for the United States Mid-Century Strategy for Deep Decarbonization
- Expert in net-zero and negative emission strategies
Haewon McJeon is a fellow at the Center for Global Sustainability (CGS) and a research scientist at the Joint Global Change Research Institute, a partnership between the Pacific Northwest National Laboratory and the University of Maryland. His research focuses on developing methods for decision-making under uncertainties surrounding climate change. Dr. McJeon’s recent work has examined large-scale technology combinations and their impact on the cost of climate stabilization, the climate implications of globally abundant natural gas, and net-zero to net-negative emissions strategies for the century. He holds a Ph.D. in Environmental Policy from University of Maryland and a B.A. in Economics from Seoul National University.
- Integrated assessment modeling & scenarios; deep decarbonization

After the U.S. withdrew from the Paris Agreement in 2017, CGS led the analysis of commitments from the more than 4,000 cities, states, businesses, universities, communities of faith, and more who pledged to support the goals of the Paris Agreement in their own capacity. Since the U.S. officially rejoined the Paris Agreement in March 2021, CGS has continued working with U.S. subnational and international partners to deliver analysis that informs how an "all-of-society" ambitious and achievable U.S. climate strategy can drive actionable and feasible policy. CGS informs U.S. climate policy from the local to global through developing integrated modeling and climate scenarios for the federal government, advising on international discussions to ramp up ambition, and collaborating from the bottom-up to move the resources necessary to set and achieve ambitious climate goals.
Learn More about Building a Comprehensive U.S. Climate PolicySchool Authors: Alicia Zhao, Haewon McJeon, Yiyun 'Ryna' Cui, Gokul Iyer, Kathleen Kennedy, Shannon Kennedy, Nathan Hultman
Other Authors: Tom Cyrs, John Feldmann, Kevin Kennedy, Kowan O'Keefe (CGS PhD Candidate), Sujata Rajpurohit, Lainie Rowland
School Authors: Morgan Edwards, Yiyun 'Ryna' Cui, Nathan Hultman, Haewon McJeon, Gokul Iyer, Jiawei Song, Alicia Zhao
Other Authors: Matilyn Bindl, Krinjal Mathur
School Authors: Haewon McJeon, Mel George
Other Authors: Mel George, Haewon McJeon
School Authors: Haewon McJeon, Leon Clarke, James 'Jae' Edmonds
School Authors: Gokul Iyer, Leon Clarke, James 'Jae' Edmonds, Haewon McJeon
School Authors: Gokul Iyer, Leon Clarke, James 'Jae' Edmonds, Nathan Hultman, Yiyun 'Ryna' Cui, Sha Yu, Haewon McJeon
Other Authors: Yang Ou, Allen A. Fawcett, James R. McFarland, Matthew Binsted, Claire Fyson, Andreas Geiges, Sofia Gonzales-Zuñiga, Matthew J. Gidden, Niklas Höhne, Louise Jeffery, Takeshi Kuramochi, Jared Lewis, Malte Meinshausen, Zebedee Nicholls, Pralit Patel, Shaun Ragnauth, Joeri Rogel J., Stephanie Waldhoff
School Authors: Yiyun 'Ryna' Cui, Nathan Hultman, Haewon McJeon, Leon Clarke
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Alicia Zhao, Yiyun 'Ryna' Cui, Shannon Kennedy
Other Authors: Kevin Kennedy, Wendy Jaglom, Erin Bridgwater, Randall Mendell, Haley Leslie-Bole, Lanie Rowland, Emily McGlynn, Tansy Massey-Green, Tom Cyrs, John O'Neill, Rebecca Gasper, John Feldmann, Kowan O'Keefe
School Authors: Haewon McJeon, Nathan Hultman, Leon Clarke
School Authors: Haewon McJeon
School Authors: Morgan Edwards, Yiyun 'Ryna' Cui, Nathan Hultman, Haewon McJeon, Gokul Iyer, Jiawei Song, Alicia Zhao
School Authors: Haewon McJeon
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Yiyun 'Ryna' Cui, Shannon Kennedy, Alicia Zhao, Jenna Behrendt
Other Authors: John O'Neill, Nathan Hultman, Leon Clarke, Haewon McJeon , Yiyun 'Ryna' Cui, Shannon Kennedy, Alicia Zhao, Jenna Behrendt
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Alicia Zhao, Jenna Behrendt, Yiyun 'Ryna' Cui
Other Authors: Kevin Kennedy, Tom Cyrs, John O'Neill, Wendy Jaglom , John Feldmann, Kowan O'Keefe
School Authors: Yiyun 'Ryna' Cui, Nathan Hultman, Haewon McJeon, Sha Yu, Morgan Edwards, Christina Bowman, Leon Clarke, Jiehong Lou, Mengye Zhu
Other Authors: Diyang Cui, Arijit Sen, Kaihui Song, Junjie Kang, Fuqiang Yang, Jiahai Yuan, Weirong Zhang
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Yiyun 'Ryna' Cui, Alicia Zhao
Other Authors: Pete Hansel, Emily McGlynn, Kowan O'Keefe, John O'Neill, Celeste Wanner
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Yiyun 'Ryna' Cui, Alicia Zhao
Other Authors: Pete Hansel, Emily McGlynn, Kowan O'Keefe, John O'Neill, Celeste Wanner
School Authors: Haewon McJeon
School Authors: Yiyun 'Ryna' Cui, Nathan Hultman, Haewon McJeon
Other Authors: Jon Sampedro, Steven J. Smith, Linlang He, Arijit Sen, Rita Van Dingenen, Ignacio Cazcarro
School Authors: Nathan Hultman, Leon Clarke, Haewon McJeon, Morgan Edwards, Yiyun 'Ryna' Cui, Christina Bowman, Jiehong Lou
Other Authors: Carla Frisch , Kevin Kennedy, Tom Cyrs, Pete Hansel, Paul Bodnar, Michelle Manion , Jessie Lund , Michael I. Westphal, Andrew Clapper , Joel Jaeger , Arijit Sen , Devashree Saha, Wendy Jaglom, Koben Calhoun, Kristin Igusky, James deWeese, Kareem Hammoud, J.C. Altimirano, Margaret Dennis, Chris Henderson, Gill Zwicker, John O'Neill




