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 Oasis Midstream in connection with preparation and negotiation of long-term gathering and processing agreement
  • Represented a client in connection with negotiation of long-term ethane export purchase agreement
  • Represented Todd Corporation in connection with negotiation of joint venture agreements and project agreements for development of methanol plant in Louisiana
  • Represented Todd Corporation in connection with investment in LNG facility in Louisiana
  • Represented a client in connection with purchase of securitized notes to fund acquisition of oil and gas wells

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  • The Best Lawyers in America, Natural Resources Law and Oil and Gas Law, 2012-2024
  • Chambers USA, Corporate/M&A and Energy: Oil & Gas (Transactional), 2022-2024
  • Legal 500 US, Recommended, 2022-2024
  • IFLR1000, Project Development, Project Finance, M&A, 2023


  • 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