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About the Firm

Experienced Excellence

O'Hanlon, Demerath & Castillo has been serving the State of Texas since 2000 with measurable success. We pride ourselves on a deep tradition of excellence, ensuring only the highest quality service. We understand the challenges and pressure that come with every case and are here for you every step of the way.

Dependable, calm, and well-spoken, our legal professionals' team adds the personal touch our clients deserve whilst approaching each new case with the attention it needs. Get in touch with us today.

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Media Buzz


Texas Supreme Court Rules in Favor of Houston ISD

March 19 2021

The Texas Supreme Court agreed with ODC attorney Dave Campbell's arguments. It ruled in favor of HISD, prohibiting the Texas Education Agency from moving forward with its attempted take over of the District. The Texas Supreme Court ruled that a state agency or head of a state department cannot override an adverse outcome at the trial court and take unauthorized actions while the appeal of that action is pending. An excellent result for the judicial system and the appellate court's power to protect their jurisdiction.

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Austin Office

808 West Ave, Austin, TX 78701


Rio Grande Valley Office

426 W Caffery Ave, Pharr, TX 78577


San Antonio Office

117 W. Craig Place, San Antonio TX 78212



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