Mario A Castillon

Mario A Castillon

McAllen, Texas
Phone 956-632-8228
Fax 956-686-6109

Mario A. Castillon, a native of San Benito, TX, is an associate in Atlas, Hall & Rodriguez’s transactional section.

Mario graduated cum lade from the University of Texas at Austin in 2015 with a B.A. in Government, and special honors in Latin American Studies. He received his law degree from the University of Texas School of Law in May 2018. He was involved in the law school’s immigration clinic and the Texas Hispanic Journal of Law and Policy. Mario has worked criminal and civil cases at a personal defense office and international law cases at the Inter-American Commission on Human Rights in Washington, D.C.

Areas of Practice

General transactional law.

Bar Admissions

Texas, 2018


University of Texas School of Law, Austin, Texas, May 2018, J.D.
Honors: Dean’s Achievement Award- Spring 2018, MD Anderson Postgraduate Fellowship in Transnational Law.
University of Texas at Austin, Austin, Texas, May 2015, BA in Government and Latin American Studies.
Honors: Cum laude, College Scholar, Phi Betta Kappa, Best Honors Thesis.

Professional Associations and Memberships

American Bar Association, Member
Hidalgo County Bar Association, Member
Hidalgo County Young Lawyers Association, Member
State Bar of Texas International Law Section, Member
American Bar Association Business Law Section, Member

Past Employment Positions:

Inter-American Commission on Human Rights, Washington, D.C., Fellow, 2018-2019