Mark R. Haskell

Mark Haskell advises his clients on matters related to the U.S. Federal Energy Regulatory Commission (“FERC”), including FERC investigations, litigation and related court appeals, and Commodity Futures Trading Commission (“CFTC”) investigations affecting the energy industry.

Mark represents natural gas and power marketers, local distribution companies, end-users, producers, industrial consumers, and liquefied natural gas (“LNG”) and shale gas developers in energy regulatory matters.

As a natural gas litigator, he handles administrative litigation for shippers affected by interstate natural gas pipeline rates, terms, and conditions of service. This work has previously involved many interstate pipeline systems. He has assisted clients in rulemaking proceedings, including FERC’s anti-manipulation rules and pipeline restructuring matters. He also addresses commercial and regulatory issues in the United States for LNG and shale gas developers.

Mark represents shippers in litigation under the U.S. Interstate Commerce Act as it relates to rates, terms, and conditions of service for regulated common carrier transportation of oil and natural gas liquids. He also assists producer/shippers involved in new common carrier pipeline development projects or pipeline expansions.

He manages FERC and CFTC investigations of physical and financial energy commodity trading and handles investigations of electric reliability-related incidents. He also develops compliance plans, pursues internal investigations, and develops energy compliance training.

Mark provides compliance-related regulatory due diligence in connection with acquisitions. He brings to his energy litigation practice experience defending gas and power refund claims associated with regulatory changes, market dislocations, and allegations of market manipulation.

Chambers USA states that Mark adeptly advises clients across the full gamut of oil and gas-related regulatory matters. Clients describe him as someone who “thinks big picture and considers business strategy” and can “balance legal risk with pragmatic experience to provide a synthesized view on FERC issues.” Another client notes, “You call Mark and you will get an answer. He's seen it all.” Mark has also been described as “supremely knowledgeable of the industry and…a dean of the enforcement defense Bar,” and “incredibly detail-oriented, extremely knowledgeable and always up to speed with changing market trends.” Chambers Global has reported that clients call Mark “[o]ne of the best oil and gas attorneys in the country” and “[a] brilliant man with a brilliant mind; he’s very well respected in the industry.”

• 2021, 2024, and 2026, “Lawyer of the Year” for Natural Resources Law, Washington, D.C., listed in Best Lawyers in America®
• 2006–2027, Energy Law and Natural Resources Law, Washington, D.C., listed in Best Lawyers in America©
• 2025–2027, Global Elite Thought Leader: USA in Energy – Oil & Gas, listed in Lexology Index (formerly Who’s Who Legal) 
• 2023–2027, Thought Leader: USA in Energy, listed in Lexology Index (formerly Who’s Who Legal) 
• 2022–2024, 2026, Exclusive Winner of the Client Choice Award for Energy & Natural Resources USA, by Lexology
• 2004–2026, Energy: Oil & Gas Law (Regulatory & Litigation), listed in Chambers Global
• 2004–2026, Energy: Oil & Gas Law (Regulatory & Litigation), listed in Chambers USA
• 2020; 2022, listed in Euromoney’s Energy and Natural Resources Best of the Best USA Expert Guides
• 2026, “Global Leaders in Energy,” listed in Lawdragon
• 2007–2023, 2025–2026, Washington, D.C., “Super Lawyer” in Energy and Natural Resources, listed in Super Lawyers
• 2012, 2014–2023, and 2025–2026, listed in The Legal 500 United States
• 2019–2023 and 2025–2026, “Leading Lawyer,” listed in The Legal 500’s Guide to Outstanding Lawyers Nationwide
• 2020–2022, Global Leader in Energy, listed in Who’s Who Legal
• 2013–2015, listed in International Who’s Who Legal for Energy Lawyers
• 2011, “MVP in Energy Law,” listed in Law360