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Haynes and Boone

Matthew Costello

Matthew Costello



  • Class Action Defense
  • Employment Litigation
  • Labor and Employment
  • Litigation

WSG Practice Industries


Haynes and Boone
California, U.S.A.

Matt Costello maintains a diverse practice, with a key focus on counseling and defending clients in state and federal court employment litigation.

Matt handles all facets of day-to-day case management in court, arbitration, and administrative agency employment matters, including early case evaluations, drafting and responding to discovery, witness interviews, taking and defending depositions, motion drafting, and communicating directly with clients to ensure close, effective working relationships. He has obtained favorable results for Fortune 500 companies spanning a variety of industries, including energy, healthcare, and technology, in a wide range of single-plaintiff, complex, and class action employment cases involving allegations of discrimination, harassment, wrongful termination, and wage and hour violations.

Matt also regularly counsels corporate clients on internal investigations, employee handbooks and policies, discrimination and harassment prevention, employee hiring and terminations, and restrictive covenants in employee contracts. He has also represented clients in complex business disputes, including trade secrets and unfair competition litigation.

Matt is dedicated to pro bono work. He works closely with the Public Law Center, a pro-bono law firm that provides access to justice for low-income residents of Orange County, California. For example, Matt assisted an Army veteran in seeking a discharge upgrade, including appearing before the Army Discharge Review Board in Washington, D.C. where he first-chaired a hearing before a five-officer military tribunal. Matt was also an integral part of a team of Haynes and Boone lawyers who partnered with several public interest groups to bring a housing discrimination lawsuit triggered by a local municipality’s efforts to shutter motels that provided long-term housing to residents of limited means, including many families with children or people with disabilities.

Bar Admissions

California, 2013


J.D., Loyola University Chicago School of Law, 2013, magna cum laude; Editor-in-Chief, Loyola University Chicago Law Journal
B.A., Psychology, University of California, Los Angeles, 2006
Areas of Practice

Class Action Defense | Employment Litigation | Labor and Employment | Litigation | Wage and Hour Litigation


2016 California Labor and Employment Update
Haynes and Boone, February 2017

2016 California Labor and Employment Legislation SB 3 Raises California's Minimum Wage SB 3 will increase the state minimum wage to $15.00 per hour over the next six years. The bill sets two minimum wage rate hikes, depending on whether an employer has 26 or more, or 25 or fewer, employees. All employers in the state must comply with the new minimum wage law...

WSG's members are independent firms and are not affiliated in the joint practice of professional services. Each member exercises its own individual judgments on all client matters.

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