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Andrew Melsheimer concentrates his practice on international oil and gas-related transactions, strategic commercial and business advice on cross-border transactions and investment projects, and dispute resolution matters. His experience includes acquisitions, divestments, trades, and mergers; exploration, development, and production matters; and anti-corruption (FCPA) and economic trade sanctions. His dispute-related matters have been before federal and state courts in Louisiana, Texas, and New York as well as domestic and international arbitration panels.

Andrew also has in-house experience through his secondment to an international energy company, where his responsibilities included handling issues related to host-government contracts, joint operating agreements, and unitization agreements.

  • Represents publicly traded, private, and national oil and gas companies in their global acquisition, divestment, trade, and merger activities
  • Advises international oil and gas companies with issues related to their host-government contracts, joint operating agreements, unitization agreements, and other ancillary contracts such as service agreements, accounting procedures, confidentiality agreements, secondment agreements, lifting agreements, FPSO purchase and lease agreements, crude oil sales agreements, pipeline agreements, and gas supply agreements
  • Advises domestic and foreign companies on FCPA compliance and investigations
  • Advises domestic and foreign companies on compliance with U.S. economic and trade sanctions
  • Assists domestic and foreign companies with strategic planning for potential litigation and arbitrations of disputes, including contractual disputes and disputes under bilateral and multilateral investment treaties
  • Defending foreign entity under an LNG sale and purchase agreement before the LCIA
  • Representing U.S. investors in prosecution of claims under NAFTA and USMCA
  • LCIA arbitration, defending claims under an LNG sale and purchase agreement
  • ICSID arbitration, prosecuting claims under United Kingdom – Egypt Bilateral Investment Treaty
  • Cairo Centre arbitration, prosecuting claims under host-government upstream contracts
  • ICC arbitration, prosecuted preemption right provision under joint operating agreement in West Africa
  • ICC arbitration, prosecuted withdrawal and preemption right provisions under joint operating agreement in North Africa
  • ICC arbitration, prosecuting breaches of obligations under joint operating agreement in South America
  • Ad hoc international arbitration, prosecuting breaches of obligations under farmout agreements in South America
  • Ad hoc domestic arbitration, prosecuting forfeiture provision under joint operating agreement
  • Ad hoc domestic arbitration under AAA rules, prosecuting enforcement of assignment of interest from defaulting party
  • ICC arbitration, defended challenge to an expert decision establishing ownership interests in a unitized oil and gas field offshore West Africa
  • ICC arbitration, defended force majeure claim under a cross-border gas supply agreement in South America
  • ICDR arbitration, prosecuted breach of a transportation agreement for pipeline capacity in South America
  • ICDR arbitration, defended contract claim related to the purchase of a refinery
  • ICDR arbitration, sought declaratory relief for the interpretation of a contractual right for payments under a Colombian concession
  • ICDR arbitration, prosecuted a collection action for a Brazilian steel company in an international arbitration on outstanding debts arising out of activities in Colombia
  • Texas state and Delaware federal court, defended discovery requests from an international arbitration under Texas procedural rules and 28 USC 1782
  • Ohio federal court, prosecuted claims against a domestic sales representative of an international energy company
  • Texas state and federal court and New York federal court, defended enforcement of an arbitral award, claims for breach of contract, attachment, breach of fiduciary duty, and equitable relief

Prior Employment

  • Law Clerk for the Former Chief Justice Catherine D. Kimball, Louisiana Supreme Court, 2002-2003

Honors & Affiliations


  • Best Lawyers in Dallas (Energy & Natural Resources), D Magazine, 2017, 2021


  • Board Member, ChildCareGroup
  • Chair of Board of Directors, Thompson & Knight Foundation
  • Member, LSU Alumni Association
  • Member, South Carolina Alumni Association
  • Member, Tiger Athletic Foundation
  • Former Member, City of Dallas Judicial Nominations Commission
  • Advisory Board Member, Institute of Transnational Arbitration
  • Member, Association of International Petroleum Negotiators; Board Member, 2016-2019; Joint Operating Agreement Revision Drafting Committee; Farmout Agreement Revision Drafting Committee; Unitization and Unit Operating Agreement Revision Drafting Committee
  • Advisory Board Member, Institute for International and Comparative Law, Center for American and International Law
  • Member, Thompson & Knight Lawyer Development Committee
  • Past Chair, International Law Section, Texas State Bar
  • Member, American Bar Association
  • Member, Dallas Bar Association
  • Member, Louisiana State Bar Association

Education & Admissions


  • J.D. and Bachelor of Civil Law, 2002, Louisiana State University, Paul M. Hebert Law Center; Senior Editor, Member, Louisiana Law Review; Order of the Coif
  • Master of International Business Studies, 1999, University of South Carolina
  • B.S., 1996, Louisiana State University


  • Louisiana
  • Texas
  • New York
  • U.S. Court of Appeals for the Fifth Circuit
  • U.S. District Court for the Eastern District of Louisiana
  • U.S. District Court for the Eastern District of Texas
  • U.S. District Court for the Northern District of Texas
  • U.S. District Court for the Southern District of Texas
  • U.S. District Court for the Western District of Texas


  • Spanish
  • Portuguese
  • French

Related Team

Thompson & Knightis now part of
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