Marion M. Reilly | Best Lawyers in Texas | HMG LLP

Marion M. Reilly

Marion brings valuable experience in appellate matters to our team. She also handles complex civil and multi-district litigation, personal injury and wrongful death cases. She has argued numerous times before the United States Court of Appeals for the Fifth Circuit and the United States Court of Appeals for the Eighth Circuit. She has briefed cases at the United States Court of Appeals for the Ninth and Tenth Circuits. She also briefed numerous matters before the United States Supreme Court, and on one, the US Supreme Court accepted the appeal and granted oral argument in Feb. 2017.

Prior to joining our team, Marion Reilly served as a judicial intern for the Honorable Emilio M. Garza of the United States Court of Appeals for the Fifth Circuit. She wrote bench memoranda for cases with oral arguments before the court and researched and drafted numerous civil and criminal opinions. Ms. Reilly also served as a judicial intern for the Honorable Rebecca Simmons of the Texas Fourth Court of Appeals in San Antonio.

Marion Reilly received her Juris Doctor degree from St. Mary’s School of Law in 2011. She graduated Magna Cum Laude and was inducted into St. Mary’s distinguished John M. Harlan Society, an honorary organization that recognizes students who have excelled academically and graduate in the top 10% of the class.

While at St. Mary’s, Ms. Reilly competed in numerous Moot Court competitions, and was named a National Champion at the Emory Civil Rights and Liberties Moot Court Competition and State Champion at the Federal Bar Association’s Moot Court Competition.

During her last year of law school, Ms. Reilly was inducted into the National Order of Barristers and received the Patricia L. Scott Award, which is reserved for St. Mary's most outstanding advocate. She received a dual bachelor of arts degree in legal studies and politics/international relations from Scripps College in California, where she frequently made the Dean’s List. Marion was named a Texas Rising Star in 2017, 2018, and 2019. She was named the Outstanding Young Lawyer of the Year in 2018.

Outside of work, Marion enjoys spending time with her three young children and watching them grow, and with her husband, who is a firefighter for the City of Shavano Park.

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Bar and Court Admissions

  • Texas 2011
  • United States District Courts: Northern, Eastern, Southern and Western Districts of Texas
  •  Supreme Court of the United States 
  • United States Courts of Appeal: 5th Circuit, 8th Circuit, 9th Circuit and 10th Circuit


  • JD 2011, St. Mary’s School of Law, San Antonio (Magna Cum Laude)
  • BA 2009, Scripps College

Professional Associations and Accolades

  • Texas Rising Star award: 2017, 2018, 2019
  • Outstanding Young Lawyer of the Year: 2018
  • Adjunct Professor at St. Mary's University School of Law
  • American Bar Association
  • Phi Delta Phi Legal Fraternity
  • The National Order of Barristers
  • St. Mary's School of Law Young Alumni Council "10 Under 10" Honoree
  • Texas Trial Lawyers Association
  • William S. Sessions American Inns of Court

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