James D. Hannagan

Although J.D. Hannagan primarily represents clients in the areas of ad valorem tax, employment law, and business litigation, his experience in these areas has opened his practice to a broad range of legal disputes, including condemnation matters, breach of contract claims, landlord/tenant disputes, and consumer actions brought under the Texas Deceptive Trade Practices Act.

He strives to produce the best outcome for his clients in the most efficient manner possible. Sometimes the best outcome requires negotiation and alternative dispute resolution. At other times, aggressive litigation is the only solution. Whether by negotiation or litigation, Mr. Hannagan works tirelessly to solve clients’ legal challenges and gain the outcomes they desire.

For his work on complex cases on behalf of his clients, he was named to the list of Texas Super Lawyer Rising Stars from 2014 to 2019. This list includes approximately 2.5 percent of the most outstanding lawyers in Texas under age 40 or with less than 10 years of experience in the law. One of the steps to selection is to be recommended by one of the more senior lawyers, the Texas Super Lawyers.

Texas Rising Stars Thomson Reuters - 2014 to 2019

Mr. Hannagan received his bachelor’s degree in business administration from Texas Christian University in 2004. After graduation, he attended Texas Tech University School of Law. During law school, Mr. Hannagan served as an Articles Editor for the Texas Tech Administrative Law Journal. During his last two years of law school, he worked at a small firm that handled legal matters ranging from high stakes personal injury cases to defending those accused of capital murder.

In 2007, he graduated from law school, was licensed by the State Bar of Texas and immediately went to work at Geary, Porter & Donovan. He practices law in all state and federal courts across Texas. He is a member of several professional associations, including the Dallas Bar Association and the Dallas Association of Young Lawyers.

Awards & Honors

Texas Rising Stars

Thomson Reuters - 2014, 2015, 2016, 2017, 2018, 2019, 2020, and 2021

Articles and Publications

Author, Judicial Review of an Agency Decision: The Implications of Mega Child Care, Inc., Texas Tech Administrative Law Journal(2006).