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Susan E. Hannagan Photo

Susan E. Hannagan


Practice Areas

  • Business Litigation
  • Business Organizations
  • Commercial Litigation
  • Complex Litigation/Dispute Resolution
  • Construction Litigation
  • Employment Litigation
  • Employment and Labor Law
  • Fiduciary Litigation
  • Noncompetition and Trade Secrets
  • Real Estate Litigation


Susan E. Hannagan
(972) 628-3600


  • Texas Tech University School of Law
    Lubbock, Texas 2007
    Juris Doctorate
    Honors: Cum Laude
  • Austin College
    Sherman, Texas 2005
    B.A. Political Science
    Honors: Magna Cum Laude

Bar Admissions

Texas, 2007

U.S. District Court, Northen District of Texas

U.S. District Court, Souther District of Texas

U.S. District Court, Western District of Texas

U.S. District Court, Eastern District of Texas

U.S. Court of Appeals for the Fifth Circuit


Honors and Awards

Texas Rising Stars, Thomson Reuters

Up-and-Coming 50 Women: Texas Rising Stars

Up-and-Coming 100 Women: Texas Rising Stars

Dallas Association of Young Lawyers – One to Watch

Attorney Bio

Susan Hannagan is a partner in the firm’s labor and employment practice. Susan represents clients in state and federal courts across Texas and the United States in employment disputes and complex business matters, including breach of contract, fraud, partnership disputes, construction, energy, consumer matters, intellectual property, and breach of fiduciary duty. She advises clients on employment issues including non-competition, non-solicitation, and non-disclosure agreements, policies and procedures, as well as in discrimination, harassment, wage and hour, and wrongful termination claims both in front of administrative bodies and in federal and state courts.

Susan serves as outside general counsel for small companies, working with their leadership teams in developing overall business strategies and identifying and solving legal risk. She works directly with clients to understand their overall goals and develop a strategy for achieving them on an individualized basis and as part of a long-term plan. Susan has experience representing clients across a wide range of industries including technology, consulting, marketing, energy, insurance, and industrial companies, as well as lending and finance institutions.

Reflecting the excellence of her legal practice, Susan has been selected as a five-time choice by Thomson Reuters to the list of Texas Rising Stars and has been recognized as an “Up-and-Coming 50 Women” and “Up-and-Coming 100” in the same listings.

Susan received her J.D., cum laude, from Texas Tech University School of Law in 2007, along with her B.A., magna cum laude, in political science from Austin College in 2005. Prior to joining MWM, Susan was a name partner at Okon Hannagan, PPLC in Dallas, Texas.

Representative Experience

  • Negotiate and draft business deals and settlement agreements on behalf of clients, including developing and implementing creative solutions to atypical legal situations;
  • Serving as lead trial counsel in a commercial lease dispute where a former landlord sued his client. As defense counsel, obtained a take-nothing judgment and an award of attorney’s fees for the client;
  • Serving as counsel in a case where an insured sued the firm’s insurance company client for bad faith. A unanimous jury returned a judgment against the plaintiff on the firm’s client’s counterclaim for fraud;
  • Serving as lead trial defense counsel in a case where the client’s former employee appealed a denial of unemployment wages to the district court, and successfully obtained a take-nothing judgment;
  • Obtaining a take-nothing judgment as lead trial counsel for a Fortune 500 company in a claim for fraud and breach of contract;
  • Obtaining temporary and permanent injunctive relief against former employees who have violated restrictive covenants and misappropriated trade secrets.

Presentations & Published Works

“Supporting Women is Good Business” – Texas Lawyer, October 2014

“A Tale of Two Statutes: Employee Leave Under the FMLA and the ADA” – Dallas Bar Association Headnotes, January 2014

“HB 40: Impact on Municipal Regulation of Oil & Gas Operations” – Dallas Bar Association Headnotes, 2016

“What Every In-House Counsel Should Know About Employment Law” – Dallas Association of Young Lawyers, panel member

DAYL Trial Skills Bootcamp series speaker and committee member

Speaker and Coordinator for DBA Law Day

Presenter for DBA Student Law Intern Program voir dire seminar

Professional Associations & Memberships

The William ‘Mac’ Taylor American Inn of Court

National Association of Minority and Women Owned Law Firms

State Bar of Texas

Dallas Bar Association

Dallas Association of Young Lawyers

Dallas Women Lawyers Association

DAYL Leadership Class