Atty. James D. Hannagan

Atty. 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.

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Profile Summary

About James D. Hannagan at a glance

James D. Hannagan is a Shareholder based in Addison, Texas, practicing at Geary, Porter & Donovan A Professional Corporation. Their practice focuses on employment, business, tax, and litigation. Educated at Texas Tech University School of Law (J.D., 2007) and Texas Christian University (B.B.A., 2004). Active member of Professional Associations and Memberships Member, Dallas Bar Association Member, Labor and Employment Section of the Dallas Bar Association Member Member, Litigation Section of the Dallas Bar Association Member, Dallas Association of Young Lawyers. Serands clients in Addison, TX and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • 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)

Practice Areas Explained

James D. Hannagan's Areas of Practice

Each practice area below reflects the types of cases James D. Hannagan handles, with a brief overview of what that area of law covers.

Employment Law

Employment lawyers represent workers in wrongful termination, discrimination, harassment, wage & hour disputes, and severance negotiations.

James D. Hannagan is one of 169,120 employment attorneys indexed nationally. Browse employment attorneys in Texas →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

James D. Hannagan is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Texas →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

James D. Hannagan is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in Texas →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

James D. Hannagan is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Texas →

Jurisdictional Context

Why local counsel matters in Texas

Practicing law in Texas. Legal matters in Texas are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Addison are typically filed in the local municipal court or the appropriate Texas state district court, depending on subject matter and amount in controversy. An attorney licensed in Texas brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Texas courts without local counsel or pro hac vice admission.

Looking for additional Texas attorneys? Browse all attorneys in Addison or all attorneys in Texas.

Frequently Asked

Common questions about James D. Hannagan

Where is James D. Hannagan's law office located?
James D. Hannagan's law practice is located in Addison, Texas. The firm is Geary, Porter & Donovan A Professional Corporation. You can contact the office directly through this profile page.
What practice areas does James D. Hannagan handle?
James D. Hannagan focuses on employment, business, tax, litigation. Each practice area listed reflects experience handling cases of that type in Texas.
Where did James D. Hannagan go to law school?
James D. Hannagan earned their education at (J.D., 2007); (B.B.A., 2004).
How can I contact James D. Hannagan for a consultation?
You can contact James D. Hannagan directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
Texas Tech University School of Law
- 2007
B.B.A.
Texas Christian University
- 2004

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