Mark R. Haskell advises 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, Mark handles administrative litigation for shippers affected by interstate natural gas pipeline rates, terms, and conditions of service. This work, prior to joining Cadwalader, has involved many interstate pipeline systems. Mark 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.

Mark manages FERC and CFTC investigations of physical and financial energy commodity trading and assists in 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.

Mark brings to his energy litigation practice experience defending gas and power refund claims associated with regulatory changes, market dislocations, and allegations of market manipulation.

A leading energy regulatory lawyer, Mark has been recognized by multiple independent commentators, including Chambers USA: America's Leading Lawyers for Business (2004–2015), Chambers Global: The World’s Leading Lawyers for Business (2004–2015), The Legal 500 United States (2012, 2014–2015), The Best Lawyers in America (2006–2016), Washington, D.C. Super Lawyers, Energy and Natural Resources (2007–2015), and International Who’s Who Legal for Energy Lawyers (2013–2015). He was also named a 2011 Law360 MVP in the area of Energy Law.

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

Mark received his B.A., with Highest Honors and Highest Distinction, from the University of Maine, where he was a member of Phi Beta Kappa, Phi Kappa Phi and Alpha Lambda Delta, and his J.D. from Harvard Law School. He is admitted to practice in the District of Columbia and before the U.S. Supreme Court.