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 his clients across the full gamut of oil and gas-related regulatory matters. He is “supremely knowledgeable of the industry and is a dean of the enforcement defense Bar,” reports a client. According to another source, Mark “is incredibly detail-oriented, extremely knowledgeable and always up to speed with changing market trends.” Chambers Global reported that clients say the Mark is “[o]ne of the best oil and gas attorneys in the country. He is top-notch.” And “[a] brilliant man with a brilliant mind; he’s very well respected in the industry.”

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  • 2021 and 2024, “Lawyer of the Year” for Natural Resources Law, Washington, D.C., listed in Best Lawyers in America®
  • 2006–2024, Energy Law and Natural Resources Law, Washington, D.C., listed in Best Lawyers in America©
  • 2022–2024, Exclusive Winner of the Client Choice Award for Energy & Natural Resources USA, by Lexology
  • 2004–2024, Energy: Oil & Gas Law (Regulatory & Litigation), listed in Chambers Global
  • 2004–2024, 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
  • 2007–2023, Washington, D.C., “Super Lawyer" in Energy and Natural Resources, listed in Super Lawyers
  • 2012, 2014–2021–2023, listed in The Legal 500 United States
  • 2019–2023, “Leading Lawyer,” listed in The Legal 500’s Guide to Outstanding Lawyers Nationwide
  • 2023, Thought Leader: USA in Energy, listed in Who's Who Legal
  • 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



  • American Bar Association
  • Energy Bar Association
Professional Activities

Mark is a member of the American Bar Association’s Section on Energy, Environment and Resources. He is also an active member of the Energy Bar Association.



  • Supreme Court of the United States
  • District of Columbia


  • Harvard Law School, JD
  • University of Maine, BA, with highest honors and highest distinction