Nathaniel R. Mattison

Our Team

Senior Fellow

Nate is a Legal Fellow at the Guarini Center. Nate’s research currently focuses on issues relating to local governments’ environmental protection and sustainability efforts. Prior to joining the Guarini Center, Nate was a law clerk to the Honorable Charles S. Haight, Jr., Senior United States District Judge for the District of Connecticut; before his clerkship, he was an associate in the litigation group at Milbank LLP, with a particular focus on antitrust matters. Nate received a BA in History from Yale University, a BA in English from the University of Cambridge, and his JD from New York University School of Law.

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Recent Publications

Zero Emission-Equipment Standards: A Strategy for Tackling New York Buildings’ Pollution at the Source

New York State’s building stock remains heavily reliant on the on-site burning of fossil fuels for various end uses, particularly space and water heating. Such use contributes to...

The Implementation of Local Building Performance Standards: An Analysis of Progress to Date and Guide for Future Policy

The buildings sector poses a significant climate challenge for local governments across the country. Energy use in buildings contributes one third of total greenhouse gas (GHG) emissions in...

Brief of the Guarini Center on Environmental, Energy and Land Use Law as Amicus Curiae, Mulhern Gas Co v. Mosley, Second Circuit

On December 10, 2025, the Guarini Center filed an amicus brief in support of New York State in Mulhern Gas Co., Inc. v. Mosley, which concerns a challenge to...