Jillian Marullo represents clients in the oil and gas, communications infrastructure and commercial property industries in all aspects of commercial litigation.

Jillian has experience in general contractual disputes, insurance and indemnity matters, and disputes arising under mineral leases, farmout agreements, joint operating agreements and commercial leases. She regularly supports clients in oil and gas lease disputes, including lease maintenance and termination, royalty, implied covenants, offset well/drainage clauses and other lease disputes.

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Jillian also handles toxic tort and environmental litigation, including suits arising under the Clean Air Act and cases involving property damage, trespass and conversion. She frequently provides advice to oil and gas industry clients pertaining to state and federal statutes and regulations, including the Outer Continental Shelf Lands Act and the Texas Natural Resources Code and related regulations, and represents clients in both onshore and offshore regulatory disputes and appeals, including in royalty and decommissioning disputes.

Her litigation experience includes matters such as tortious interference with contract, breach of contract and warranty, breach of fiduciary duty, and negligent and fraudulent misrepresentation and concealment. Jillian also has experience in defamation, business disparagement, unfair competition and employment matters, including those related to non-competition and non-solicitation agreements, misappropriation of trade secrets and breach of fiduciary duty.

Representative Experience

  • Obtained multi-million-dollar arbitration award on behalf of major oil and gas company in indemnity dispute.
  • Submitted amicus curiae brief on behalf of the Texas Oil & Gas Association in Key Operating v. Hegar in the Texas Supreme Court.
  • Submitted amicus curiae brief on behalf of EOG Resources, Inc. in Southwest Royalties, Inc. v. Hegar in the Texas Supreme Court.

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  • Negotiated settlements of cases involving damage to commercial infrastructure, personal injuries, and oil and gas royalty, commercial lease and other contractual disputes.
  • Successfully argued multiple dispositive motions in a variety of cases, including contractual, oil and gas lease, and commercial lease disputes as well as Clean Air Act, toxic tort, and employment law cases.
  • Represented energy clients during audits and in appeals and administrative proceedings before the Interior Board of Land Appeals and the Texas General Land Office.
  • Represented clients pro bono in guardianship proceedings and mediation, resulting in their appointment as permanent guardians of the person of three minors.

Professional Highlights

  • Named a “Rising Star” by Texas Super Lawyers, 2022
  • Named to Best Lawyers “Ones to Watch,” 2021
  • Named a “Top Lawyer” by Houstonia Magazine, December 2016

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  • Memberships & Associations
    • Houston Bar Association’s Energy Law Section Council
    • Member, The Foundation for Natural Resources and Energy Law
    • The Institute for Energy Law’s Inaugural Leadership Class
    • CASA Volunteer
    • State Bar of Texas – Environmental and Natural Resources Section, Oil Gas & Energy Resources Section, and Litigation Section
    • Houston Young Lawyers Association
    • Texas Young Lawyer’s Association
    • Women’s Energy Network
    • Texas Association of Defense Counsel
  • Awards & Recognition
    • Achieved top score on the Texas Bar Exam, February 2013
    • Recipient of Houston Young Lawyers Association’s Associate Member Praise Award, 2011
    • Recipient of South Texas College of Law Student Bar Association’s President Award, 2011-2012
  • Presentations
    • “Unpacking a Year of Extremes: New Take-Aways in Force Majeure Analysis,” April 8, 2021
    • “Courting the Court: Ethical Implications of Judicial Campaign Contributions,” November 11, 2015
    • “Enbridge In-House Seminar Casualty and Spill Response: How Things Have Changed!” October 15, 2013
    • Selected Publications
    • "Revisiting Force Majeure: The Texas and Louisiana Perspectives," Rocky Mountain Mineral Law Foundation Natural Resources Law Network, April 2020
    • "Yanny or Laurel? Black & Blue or White & Gold Dress? Fixed or Floating Royalty? The Texas Supreme Court Decides Another Fixed or Floating Royalty Case," Oil & Gas E-Report Issue 3, A Publication of the Institute for Energy Law, October 8, 2018
    • “Ethical Considerations in Government Investigations of Corporations,” Rocky Mountain Mineral Law Foundation, Special Institute on Federal Offshore Regulatory Enforcement, January 20-21 2016, Houston Texas


  • J.D., South Texas College of Law, 2013
    summa cum laude; Valedictorian; Information Editor, South Texas Law Review

    B.S., Resources and Environmental Studies, Texas State University, 2008
    magna cum laude

    B.S., Criminal Justice, Texas State University, 2008
    magna cum laude


  • Texas


  • U.S. District Court for the Southern District of Texas

    U.S. District Court for the Northern District of Texas

    U.S. District Court for the Eastern District of Texas

    U.S. District Court for the Western District of Texas