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Longtime Houston Energy Partner Laterals to Troutman 

July 15, 2026 Elle Grinnell

Mac Marshall, an energy partner, has joined Troutman Pepper Locke in Houston from Norton Rose Fulbright. He will focus his practice on upstream and midstream energy transactions, including acquisitions and divestitures, commercial agreements and energy financings, according to a news release. 

Before joining Troutman Pepper Locke, Marshall practiced at Norton Rose Fulbright for nearly four years, where he advised clients on upstream and midstream energy transactions, joint ventures and financings. He represented clients in acquisitions and divestitures of producing and non-producing oil and gas properties, as well as the purchase, sale, construction and financing of pipelines, gathering systems and storage facilities. He also advised lenders and borrowers on reserve-based lending, mezzanine financings, and revolving and term credit facilities. Before joining Norton Rose in November 2022, Marshall was an energy partner at Porter Hedges for nearly 12 years. Prior to that, he was an associate at Thompson & Knight for five years.

“Mac has built a strong reputation in commercial midstream contracts, and his command of upstream acquisitions and divestitures is exactly the kind of depth we have been looking to add to our practice,” said Christine Byrnes, leader of Troutman Pepper Locke’s Energy Transactional Practice Group. “His arrival, alongside the recent addition of Allison Perlman, reflects deliberate momentum we are building across the full range of complex energy transactions, and that growth translates directly into stronger, more comprehensive capabilities for our clients.”

AREAS OF FOCUS 
Marshall advises clients on upstream and midstream energy transactions, including acquisitions and divestitures, joint ventures, project development and energy financings. His practice includes negotiating commercial midstream agreements, including gathering, processing and treating agreements, hedging arrangements, NAESB contracts and seismic data licenses. He also advises lenders and borrowers on a range of energy financing transactions and is board certified in oil, gas and mineral law by the Texas Board of Legal Specialization, according to the release. 

EDUCATION
University of Houston (JD, 2006)
Vanderbilt University (BA, 2001)

Elle Grinnell

Gabrielle “Elle” Grinnell is assisting with coverage on pro bono, public service, and diversity and litigation.

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