Photograph of Siyi Shen

Siyi Shen


Siyi Shen is an associate in the Environment & Natural Resources Group in the Washington, D.C. office. Her practice covers regulatory counseling, litigation, and mediation involving major environmental statutes, including the Clean Air Act, Clean Water Act, RCRA, and CERCLA, with an emphasis on climate change, air quality, and sustainability. Siyi also has significant experience with ESG disclosure and California’s clean air and climate law, policy, and governance.

Siyi maintains an active pro bono practice, advising non-profit organizations on ESG and climate change issues involving product sustainability certifications, voluntary carbon markets, and climate-friendly employee benefits.

Prior to joining Crowell & Moring, Siyi was an attorney and researcher with one of the nation’s leading think tanks on environmental and climate change matters, where her work focused on carbon emissions trading system in California, climate change insurance law, and global plastic waste trade.


  • Tongji University, LL.B. (2014)
  • University of California, Berkeley School of Law, LL.M. (2015)
  • Vanderbilt University Law School, J.D. (2017)


Professional Activities and Memberships

  • Vice Chair, Climate Change, Sustainable Development, and Ecosystems Committee—American Bar Association’s Section on Energy, Environment, and Resources

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Environment and Natural Resources


Environmental, Social, and Governance

Climate Change

Clean Air Act

Environment and Resources Litigation

Contaminated Lands and Hazardous Waste

Show more practices…

"Tips For Establishing Associational Standing," Law360 (March 29, 2023). Authors: Daniel W. Wolff, Elizabeth B. Dawson, Siyi Shen.
"President Biden To Sign New Inflation Reduction Act," Biden 2021 Series (August 15, 2022). Contacts: Byron R. Brown, Rebecca Baden Chaney, Stephanie L. Crawford, James G. Flood, Eric Homsi, Irina Pisareva, Mary-Caitlin Ray, Tim Shadyac, Siyi Shen, Hillary C. Webb, Scott L. Winkelman
Client Alert / Newsletter
"FERC Proposes Major Interconnection Process Reforms," Energy Law Alert (June 24, 2022). Contacts: Larry F. Eisenstat, Patricia M. Alexander, Siyi Shen
Client Alert / Newsletter
"Emissions Trading in California: Lessons for China," Emmett Institute on Climate Change and the Environment, UCLA School of Law (June 2022). Co-author: Siyi Shen.
As Biden Pushes For Zero-Emission Fleet, Lawyers Face Challenges To Implement Transition The National Law Journal (June 1, 2022)
Press Coverage
"Zero-Emission Vehicle Transition For Federal Fleets: A Practical Discussion," National Law Journal (May 20, 2022). Authors: Paul Freeman, Thomas A. Lorenzen, and Siyi Shen.
"Coordinated Governance of Air & Climate Pollutants: Lessons from the California Experience," Emmett Institute on Climate Change and the Environment, UCLA School of Law (July 2020). Co-author: Siyi Shen.

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Crowell & Moring LLP is an international law firm with offices in the United States, Europe, MENA, and Asia that represents clients in litigation and arbitration, regulatory and policy, and transactional and corporate matters. The firm is internationally recognized for its representation of Fortune 500 companies in high-stakes litigation and government-facing matters, as well as its ongoing commitment to pro bono service and diversity, equity, and inclusion.

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