Mark is incredibly knowledgeable of the legal space but he also keeps client concerns and goals at the forefront of his counsel and work.

Chambers USA, 2024

Mark Lewis, managing partner of the firm’s Washington, DC office, focuses his practice on oil and gas pipeline and related midstream, regulatory and transactional matters. His clients include oil and gas pipeline developers, owners, operators and investors; oil and gas producers and marketers; gas distributors; and large industrial energy consumers.

He handles US and international oil and gas pipeline development projects with respect to project structuring, contracting and governmental approvals. He represents regulated pipelines, pipeline ownership interests regarding pipeline management issues, clients in transactions involving the acquisition of pipeline companies and pipeline assets, and developers of pipelines and other oil, gas and CO₂ infrastructure. In his practice, Mark provides legal counsel in contract negotiations involving operating, transportation, and purchase and sale agreements. He also advises clients regarding regulatory aspects of project development, contract, tariff, rate and compliance matters before the Federal Energy Regulatory Commission (FERC) and various state regulatory agencies.