
Environment
USA Guide 2026 : California
Rankings

Ranked Individual
Ranked Individual
About
Provided by WilmerHale
Our lawyers draw on a long history in environmental law, energy project financing and permitting, public land use, climate change policy, and environmental justice to solve complex challenges. Clients depend on our legal skill and insight from government service to achieve their objectives, and they also depend on our industry and technical understanding—we have represented entities from a wide range of industries, including oil and gas, renewable energy, gas and electric transmission and distribution, mining, recreation, aviation, defense, real estate, education, life sciences and pharmaceuticals, and financial services.
We help these clients to manage environmental enforcement and other litigation challenges; to develop and permit energy production, transmission, and generation projects in the renewable, oil and gas, and nuclear sectors; and to navigate an increasingly complex regulatory playing field, including on matters related to climate change and environmental justice. Our team, which includes former high-ranking officials at the US Interior and Defense Departments, and the US Justice Department’s Environment and Natural Resources Division, is well prepared to assist clients in government investigations and to respond to other facets of high-profile crises.
To learn more, visit: https://www.wilmerhale.com/en/solutions/energy-environment-and-natural-resources
Chambers Review
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Notable Practitioners
Provided by Chambers
Band 2 
Band 2 
Peggy O Otum
Peggy Otum is especially active advising clients on Superfund matters, hazardous waste issues and enforcement proceedings. She offers adroit counsel across environmental compliance, transactional support and complex litigation.
Ranked Individuals at WilmerHale (1)
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Peggy O Otum
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