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John Marciano


Washington, D.C.

Image of John Marciano
John Marciano


Washington, D.C.

John is a partner in the global Projects, Energy, Natural Resources and Infrastructure practice, based in our Washington, D.C. office. John’s practice encompasses tax, legal, and commercial advice on energy and infrastructure projects. He also counsels clients in all aspects of the budding unmanned aviation industry, including financing fleets of unmanned aerial systems. His work includes advising on capital-raising and deployment strategies for a wide range of clients, primarily in connection with solar, wind, geothermal, fuel cell and biomass projects.

John is a ranked lawyer in Chambers USA, Nationwide Projects: Renewables and Alternative Energy (2017-2022) and Chambers Global, Projects: Renewables & Alternative Energy (2017-2022). John is also a ranked lawyer in The Legal 500 US, Energy: Renewable/Alternative Power (2017-2022); Project Finance: Advice to Sponsor (2019-2020); Project Finance (2018) and “Leading Lawyer” (2019-2022). John is listed on the kWh Analytics #solar100 and is listed on the A Word About Wind, Top 100 Legal Power List (2018, 2020). John was also honored in the Financial Times’ Most Innovative Law Firms 2015 Report.

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Publications: 10 August 2022

Webinar: A lively discussion on the Inflation Reduction Act's renewables proposals

In this webinar, we discuss proposals for tax subsidies to further accelerate the implementation of renewable energy, carbon capture, hydrogen, advanced manufacturing, and other important technologies…

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Publications: 03 August 2022

Energy provisions and related tax credits in the Inflation Reduction Act of 2022

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News: 15 February 2022

Allen & Overy continues to grow Projects, Energy, Natural Resources and Infrastructure practice with Chip Cannon

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Publications: 07 December 2021

November 2021 update: U.S. House Ways and Means Committee Build Back Better Act - proposals related to tax credits and clean energy

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Washington, D.C.

Allen & Overy LLP
1101 New York Avenue, NW
Washington, D.C.

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Admitted: Bar of the District of Columbia


LL.M., Georgetown University Law Center

J.D., University of Pittsburgh School of Law

B.A., Canisius College

Published Work

  • John Marciano III (2015) “Renewable Power Tax Credit Reference Guide"


Band 1

Chambers USA, Projects: Renewables and Alternative Energy (2017-2020)

Band 1

Chambers Global, Projects: Renewables and Alternative Energy (2017-2020)

Leading Lawyer

The Legal 500 US (2019-2020)