Jack Langlois - McDermott Will & Emery


Jack Langlois is the office managing partner for Houston. Jack focuses his practice on energy related matters, including upstream, midstream and downstream. He advises clients on investments in and financings of energy projects and assets, including, mergers, joint ventures and acquisitions and dispositions of assets and stock of energy companies. Jack represents public and private companies, private equity investors, lenders, governments and national oil companies in a number of substantial domestic and international corporate transactions. Jack advises on mineral exploration and development projects, including matters involving acquisition of exploration and development rights, pipelines, gathering, transportation, processing, storage, and other infrastructure.

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  • Represented a national oil company in the development and preparation of joint venture agreements in connection with partner solicitations for acquiring and developing deep water assets with value in excess of US $10 billion*
  • Represented an investor in preparation of equity agreements for joint venture to acquire and develop LNG project in Louisiana*
  • Represented a majority investor in negotiation of joint venture to acquire existing assets and develop methanol plant in Louisiana with value in excess of US $1 billion*

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  • The Best Lawyers in America 2012 to 2023, Natural Resources Law and Oil and Gas Law
  • Legal 500 USA, 2022
  • Chambers USA, 2022
  • Corporate/M&A, Texas
  • Nationwide Energy: Oil & Gas


  • American Bar Association Energy Law Section, member
  • State Bar of Texas, member


Louisiana State University Law Center, JD, 1979
University of Southwestern Louisiana, BA with honors, 1976