Debbie McComas


Education and Clerkships

J.D., Tulane University, 1995, cum laude; Managing Editor, Tulane Maritime Law Journal; Associate Justice, Tulane Moot Court Board

B.A., Austin College, 1990, with honors

Bar Admissions





Debbie McComas has argued before the Texas Supreme Court, petitioned the United States Supreme Court, reversed unfavorable jury verdicts, and persuaded arbitration panels. Whether before the highest courts or a trial court in rural East Texas, Debbie dedicates herself to her clients and brings practical solutions to uncommon problems.

Debbie has led teams in significant appeals and trial matters throughout the country. She argued In re Schmitz to the Texas Supreme Court, a case that set the standard for shareholder derivative suits against Texas corporations. Her extensive knowledge of both state and federal procedure and her ability to quickly grasp facts and legal issues allows her to aid her clients on a broad array of subjects, including the oil and gas industry, where she has represented both owners and operators.

A consummate advocate, Debbie is also dedicated to her community and is proud to serve as co-chair of Haynes and Boone’s Pro Bono and Public Service Committee. She also serves as a member of the Board of her church. She is honored to have received the Light of Justice Award from the Texas Defender Service for her pro bono achievements.

Professional Recognition

  • Honored with the Texas Defender Service Light of Justice Award (2014)
  • Texas Super Lawyers - Rising Stars, Thomson Reuters, Appellate (2004-2008)

Pro Bono


Haynes and Boone Wins Asylum for Sudanese Mother and Children

A team of Haynes and Boone, LLP lawyers, working in conjunction with the Human Rights Initiative, recently obtained asylum for a mother and her four children facing imminent physical harm and persecution if forced to return to Sudan.

Selected Client Representations

  • Successfully argued case of first impression regarding shareholder derivative actions to the Texas Supreme Court
  • Representation of gas well operator and owner in arbitration seeking damages from service company that damaged well during cement operations
  • Representation of oil and gas operator’s interests in lawsuit over joint operating agreement
  • Representation of lenders in various lawsuits involving oil and gas interests
  • Representation of real estate interests in property disputes
  • Representation of lender in $2.5 billion lender liability lawsuit stemming from the bankruptcy of Adelphia Communications Corporation and its subsidiaries
  • Representation of foreign corporations in trade secrets disputes
  • Representation of creditors in judgment enforcement proceedings, including enforcement of a more than $100 million judgment against an Indonesian corporation
  • Representation of Cayman Islands bank in West Texas lender liability lawsuit, successfully affirming dismissal for lack of personal jurisdiction

Professional and Community Activities

  • Federal Circuit Bar Association (2008-present), Model Patent Jury Charge Sub-Committee Member (2008-2009)
  • Co-Chair, Dallas Bar Association Judiciary Committee (2006)
  • Co-Vice Chair, Dallas Bar Association Judiciary Committee (2005)
  • Co-Chair, Dallas Bar Association Judicial Evaluation Poll SubCommittee (2003, 2004)

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