Hallett & Perrin, P.C.
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Leland C. de la Garza

President & Managing Shareholder
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Leland C. de la Garza

President & Managing Shareholder
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1%. Only 1% of Texas lawyers are Board Certified in Civil Trial Law by the Texas Board of Legal Specialization, a distinction earned by trial experience and a thorough examination process. Leland has been board certified in civil law since 2002. For over thirty years, when the stakes are high and business owners and executives needed counsel they can trust, and the best lawyer in the room, they have turned to Leland. Leland has the experience to represent clients in state and federal courts in Texas and in other states.

Leland’s experience cuts across many different industries, including financial institutions, investment funds, insurance agencies, and intermediaries, wind energy companies, oil and gas exploration companies, oil field service companies, manufacturing companies, staffing companies, companies involved in construction, and professionals in a variety of fields. His vast experience includes contract disputes, shareholder and partner fights, breach of fiduciary duty claims, trademark, copyright and patent disputes, real estate disputes, trade secret and covenant not to compete disputes, construction disputes, and probate cases.

Leland has handled many high profile and bet-the-company cases. Leland applies creativity, forceful presentation, and undeterred determination to get his clients the best results possible.

Leland has also been a professional drummer since 2009, most recently with the Tom Petty tribute band, American Petty.

Representative Experience

  • Negotiated buy out of minority shareholders of restaurant and insurance agency
  • Prosecuted claims in state court against oil and gas companies for misappropriating overriding royalties and working interests; settled, bringing an end to 16 years of litigation
  • Defended claims against part owner of restaurant for breach of LLC operating agreement by improperly amending agreement; settled
  • Defended claims against insurance agency for negligently making referral of roofer; settled
  • Prosecuted claims against cryptocurrency platform arising from hack of website and loss of cryptocurrency; settled
  • Defended claims in state court arising from real estate development in Mexico; motion to dismiss based on forum selection clause and forum non conveniens granted
  • Defended bus company against claims in state court arising from accident in Mexico; motion to apply Mexican law granted and summary judgment dismissing lawsuit granted
  • Defended oil and gas company against claims for damage to surface of land caused by oil and gas development; settled
  • Prosecuted claims in state court for owners of commercial buildings in downtown Fort Worth that former lender’s option to purchase loan from another lender was unenforceable; obtained temporary injunction and then settled
  • Defended commercial insurance agency in state court alleging failure to procure requested property insurance; summary judgment obtained that policy provided requested coverage
  • Defended claims in South Texas state court against wind energy operator brought by land owner alleging breach of wind lease; settled
  • Prosecuted claims in state court and arbitration against hedge fund former employee for violating covenant not to compete; settled
  • Prosecuted claims in state court against physician for violating covenant not to compete; settled
  • Negotiated and drafted agreements for cash production payments for oil and gas company
  • Defended owner of Oklahoma apartment project in Oklahoma federal court against claims for developer fees; settled
  • Defended a Texas manufacturer of embalming products against product liability claims brought in New Jersey federal court by a funeral director who alleged that exposure to the embalming products caused her leukemia; settled
  • Prosecuted claims against gas well operator for mismanagement resulting in loss of leases; settled
  • Prosecuted claim to remove oil and gas lien; settled
  • Defended claims in state court involving ownership of oil and gas firm; settled
  • Prosecuted claims in federal court in New York involving earn-out payment following sale of business; settled
  • Defended oil and gas companies against multiple property owner claims resulting from a brine spill; settled
  • Prosecuted claims in state court alleging unfair competition and trademark and trade dress infringement in dispute between restaurant owners; settled
  • Prosecuted claims in state and federal court alleging violation of state statute related to publishing likeness of plaintiff on the internet; settled
  • Defended claims in state court alleging illegal tracking of a vehicle; secured dismissal through and anti-SLAPP motion
  • Prosecuted claims in state court alleging unfair competition and theft of trade secrets in medical products field; settled
  • Defended and prosecuted claims in state court arising from dispute over performance of IT contract involving dental practices; settled
  • Prosecuted claims in state court against former employee of manager of investment funds related to non-competition covenants; settled
  • Defended oil and gas operator in state court in dispute with driller and drilling consultant over failed well after separation of casing during drilling; settled
  • Prosecuted claims in federal court against finance companies that financed the sale of buses used in Mexico over claims that sellers misrepresented that the buses could be used in Mexico; settled
  • Defended video production company in state court in dispute over ownership of video footage from video shoot; settled
  • Defended physicians and medical practices in federal court dispute over advertising, involving claims under the federal Lanham Act, federal anti-trust violations, and common law claims of unfair competition, false advertising, and misappropriation claims; settled
  • Prosecuted claims in state court against international integrated oil and gas company over whether statements to the Texas Railroad Commission about the condition of oil and gas wells were fraudulent; settled
  • Represented prominent Dallas family in state court in dispute involving claims of defamation and invasion of privacy; settled
  • Represented subcontractor in disputes in state court with sub-subcontractor and general contractor on highway construction project over termination of sub-subcontractor; tried and settled
  • Represented owner in dispute with general contractor over dispute over interior finish out project; tried
  • Defended national swimming pool licensor in state court against claims of trademark infringement and tarnishment; tried and appealed
  • Prosecuted claims in state court against former president of division of commercial insurance agency for theft of company funds and breach of fiduciary duty; tried
  • Defended national bank in east Texas state court against claims of lender liability; tried
  • Prosecuted indemnity claims following sale of business; arbitrated in New York
  • Prosecuted claim against national beer company for failure to approve sale of distributorship; arbitrated
  • Defended international oilfield supplier against lawsuit by the Republic of Iraq filed in New York federal court; dismissed and dismissal affirmed on appeal
  • Prosecuted claim in arbitration involving royalty dispute over leases in Colorado and Utah; settled
  • Defended wind energy company against claim in state court for finder’s fee; summary judgment
  • Defended landscaping company against claims in federal court under FLSA for overtime; settled

Distinctions & Certifications

  • Fellow, Texas Bar Foundation
  • Board Certified in Civil Trial Law by the Texas Board of Legal Specialization, 2002-present
  • The Best Lawyers in America© 2019-2025
  • Selected for inclusion in Texas Super Lawyers by Thomson Reuters, 2003, 2009-2012, 2020-Present
  • D Magazine Best Lawyers Recipient 2017-2020, 2022-2023
  • America’s Top 100 Civil Defense Litigation 2021-2022
  • Martindale-Hubbell, AV Preeminent, Peer Review Rated
  • Eagle Scout and Member, Order of the Arrow

Professional Activities

  • Chairman, Texas Supreme Court Unauthorized Practice of Law Committee, 2008-2018
  • Vice-Chairman, Texas Supreme Court Unauthorized Practice of Law Committee, 2024 to present
  • Member, Texas Unauthorized Practice of Law Committee, 2005-present
  • Vice-Chairman, Texas Supreme Court’s International Law Task Force, 2009-2012
  • Founder and Chairman, Dallas Bar Association Trial Skills Section, 2000-2001
  • State Bar of Texas - Litigation and Anti-trust Law Sections
  • Dallas Bar Association - Business Litigation and Trial Skills Sections
  • Dallas Bar Foundation

Publications & Speeches

  • Frequent speaker and author on a variety of topics related to litigation and the unauthorized practice of law
     

Community Involvement

  • Trustee, The Child Protection Connection (formerly Texas Lawyers for Children), 2008-present
     
  • Soccer Coach, Cedar Hill Soccer Association (2006-2017)

"Leland is a superb tactical attorney, and he grasped complex and nuanced details of our case immediately. Not only was he passionate, thoughtful, and thorough, Leland was a gentleman and a true joy to work with during the stressful process of litigation."

— Greg McCabe, Midland Oil and Gas Company Executive