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J.D., University of Houston Law Center, Houston Journal of International Law, Member of Editorial Board, 2006

B.A., magna cum laude, Economics, Vanderbilt University, 2001





Mac Marshall is a partner in the energy section of Porter Hedges. His practice focuses on wide range of energy-related projects located onshore, offshore, upstream, midstream and internationally, including:

  • acquisitions and divestitures of producing and non-producing oil and gas properties
  • acquisitions, divestitures, construction and financing of pipelines, gathering systems and storage facilities for natural gas, crude oil, condensate, and natural gas liquids
  • oil and gas joint ventures and exploration and development programs
  • exploration and development project agreements including joint operating agreements, COPAS accounting procedures
  • exploration and development agreements and joint operating agreements
  • natural gas purchase, sales and marketing agreements and NAESB agreements
  • natural gas gathering, processing and treating agreements, oil and gas transportation agreements, and related midstream agreements
  • gas storage agreements
  • bankruptcy asset sales and restructurings
  • production handling agreements
  • master service agreements and drilling contracts
  • hedging agreements
  • seismic data licenses and acquisition agreements

Mac also represents lenders and borrowers in a wide variety of conventional and mezzanine energy financing and related secured transactions, including reserve-based lending and revolving and term credit facilities. Mac is licensed in Texas and Louisiana, and is Board Certified by the Texas Board of Legal Specialization in Oil, Gas and Mineral Law.  He has been selected for inclusion in Texas Rising Stars in 2016 for Energy & Resources.

Representative Experience

  • Represented a Japanese conglomerate in a $1.4 billion venture with a major U.S. oil and gas company to jointly explore for and develop natural gas in the Marcellus shale formation
  • Representation of large US exploration company in approximate $3.2 billion Marcellus shale joint venture (including acquisition of related gathering company and structuring of gathering agreements)
  • Representation of major Eagle Ford shale exploration company in negotiating gathering, processing, transportation, treating and related agreements for its Eagle Ford shale joint venture acreage originally acquired for $1.325 billion
  • Representation of major Marcellus shale exploration company in restructuring gas gathering and processing agreements for acreage originally acquired in an $11 billion merger
  • Represented Texas-based exploration and production companies in the disposition of their interests in Colombian concession agreements
  • Represented a private equity company in a $400 million venture with a major U.S. oil and gas company to jointly explore for and develop natural gas in the Eagle Ford Shale Formation
  • Representation of numerous oil and gas exploration companies in establishing and funding joint ventures and partnerships for oil and gas exploration and development projects
  • Representation of numerous oil and gas producing companies in acquisitions and divestitures of onshore and offshore producing oil and gas properties
  • Representation of refining company in structuring $500 million crude feedstock supply agreement for refinery in Hawaii
  • Representation of agent bank in gas storage project financing
  • Representation of commercial banks in producer financings in excess of $500 million secured by onshore and offshore producing oil and gas properties
  • Represented the agent bank in a $900 million syndicated credit facility for a pipeline company
  • Represented the agent bank in a $375 million syndicated credit facility for a refining company

Professional / Civic Affiliations

  • State Bar of Texas, Member
  • American Bar Association, Member
  • Houston Bar Association, Member
  • Houston Young Lawyers Association, Member
  • Vanderbilt Alumni Association, Member
  • Houston Livestock Show & Rodeo, Member
  • Boy Scouts of America, Eagle Scout