- 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: Yiyun 'Ryna' Cui, Jenna Behrendt, Andy Miller, Matthew Zwerling, Christoph Bertram, Mel George, Shannon Kennedy, Michael I. Westphal, Maria Borrero, Alicia Zhao, Gokul Iyer, Kathleen Kennedy, Zarrar Khan, Jiehong Lou, Haewon McJeon, Mengye Zhu, Nathan Hultman
Other Authors: Alexandra Kreis, Dillon Walton, Aldana Joel Canton, Shiqi Chen, Yingtong Li, Kowan O’Keefe
School Authors: Christoph Bertram, Steven J. Smith, Shannon Kennedy, Jenna Behrendt, Haewon McJeon, Yiyun 'Ryna' Cui, Nathan Hultman
Other Authors: Henry Liu
School Authors: Gokul Iyer, Yiyun 'Ryna' Cui, James 'Jae' Edmonds, Nathan Hultman, Haewon McJeon, Yang Ou
Other Authors: Allen Fawcett
School Authors: Alicia Zhao, Haewon McJeon
School Authors: Haewon McJeon, Steven J. Smith
Other Authors: Leeya Pressburger, Kalyn Dorheim, Trevor F Keenan, Ben Bond-Lamberty
School Authors: Yiyun 'Ryna' Cui, Jiehong Lou, Alicia Zhao, Jenna Behrendt, Haewon McJeon, Nathan Hultman
School Authors: Kavita Surana, Kathleen Kennedy, Haewon McJeon
Other Authors: Morgan Edwards, Zachary Thomas, Ellen Williams
School Authors: Haewon McJeon
Other Authors: Jay Fuhrman, Candelaria Bergero, Maridee Weber, Seth Monteith, Frances M. Wang, Andres F. Clarens, Scott C. Doney, William Shobe
School Authors: Yang Ou, Gokul Iyer, Nathan Hultman, Haewon McJeon, Steven J. Smith, James 'Jae' Edmonds
Other Authors: Allen Fawcett, Shaun Ragnauth
School Authors: Jenna Behrendt, Mengye Zhu, Yiyun 'Ryna' Cui, Meredydd Evans, Nathan Hultman, Haewon McJeon, Steven J. Smith
Other Authors: Sha Yu, Xinzhao Cheng, Wenli Li, Baobao Liu, Jared Williams, Haiwen Zhang, Qimin Chai, Minpeng Chen, Fei Guo, Lena Höglund Isaksson, Nina Khanna, Jiang Lin, Yazhen Wu
School Authors: Jenna Behrendt, Mengye Zhu, Yiyun 'Ryna' Cui, Meredydd Evans, Nathan Hultman, Haewon McJeon, Steven J. Smith
Other Authors: Jared Williams, Haiwen Zhang, Baobao Liu, Xinzhao Cheng, Sha Yu, Wenli Li
School Authors: Gokul Iyer, James 'Jae' Edmonds, Nathan Hultman, Haewon McJeon
Other Authors: Gokul Iyer, Yang Ou, James 'Jae' Edmonds, Allen A. Fawcett, Nathan Hultman, James McFarland, Jay Fuhrman, Stephane Waldhoff, Haewon McJeon
School Authors: Gokul Iyer, James 'Jae' Edmonds, Nathan Hultman, Haewon McJeon
Other Authors: Gokul Iyer, Yang Ou, James 'Jae' Edmonds, Allen A. Fawcett, Nathan Hultman, James McFarland, Jay Fuhrman, Stephane Waldhoff, Haewon McJeon
School Authors: Alicia Zhao, Shannon Kennedy, Yiyun 'Ryna' Cui, Haewon McJeon, Nathan Hultman, Camryn Dahl
Other Authors: Kowan O’Keefe, Maria Borrero, Kyle Clark-Sutton, Grace Deye, John Feldmann, Kevin Kennedy, Miguel Moravec, Dimitri Nilov, Sujata Rajpurohit, Joaquin Rosas, Claire Squire
School Authors: Yiyun 'Ryna' Cui, Jiehong Lou, Alicia Zhao, Jenna Behrendt, Gokul Iyer, Haewon McJeon, James 'Jae' Edmonds, Sha Yu, Nathan Hultman
Other Authors: Baihe Gu, Jiawei Song, Leon Clarke, Yi Wang, Xianchun Tan, Kaiwei Zhu, Yuhui Sheng, Hanbing Zhai, Lingsi Kong, Yonglong Cheng, Jon Sampedro, Stephanie Waldhoff
School Authors: Alicia Zhao, Haewon McJeon, Yiyun 'Ryna' Cui, Kathleen Kennedy, Shannon Kennedy, Nathan Hultman
Other Authors: Kowan O’Keefe, Kyle Clark-Sutton, John Feldmann, Kevin Kennedy, Jake Meisel, Dimitri Nilov, Sujata Rajpurohit
School Authors: Yiyun 'Ryna' Cui, Haewon McJeon, Jiehong Lou, Sha Yu, Nathan Hultman
Other Authors: Maria Borrero, Claire Squire
School Authors: Haewon McJeon, Nathan Hultman
Other Authors: Russell Horowitz, Matthew Binsted, Morgan Browning, Allen Fawcett, Claire Henly, James McFarland
School Authors: Leon Clarke, Haewon McJeon, Alicia Zhao
Other Authors: John Bistline, Nikit Abhyankar, Geoffrey Blanford, Leon Clarke, Rachel Fakhry, Haewon McJeon, John Reilly, Christopher Roney, Tom Wilson, Mei Yuan, Alicia Zhao
School Authors: Haewon McJeon
Other Authors: Hanwoong Kim, Dawoon Jung, Hanju Lee, Candelaria Bergero, Jiyong Eom








