President and Director
John A. Guerra was born in McAllen, Texas and was raised on his family’s cattle ranch in Starr County, Texas. He interned at the firm in 1987 and became an associate in 1989. He later became a shareholder in 1994 and President of the firm in 1996. He continues to manage the affairs of the firm today, while remaining active as lead trial counsel on a full docket of cases. Read Biography
Vice President and Directors
Robert R. Stearns
Robert Stearns was born in Trenton, Michigan and grew up in the Greater Detroit Area. He attended Wayne State University in Detroit, where in his third year, he was the co-Chair of the Law School’s national mock trial team.
Brittany K. Barrera
Brittany Barrera was born in Corpus Christi, Texas. She received her Bachelor of Arts and Sciences, summa cum laude in Political Science and History in 2013 from Texas A&M University Kingsville. Brittany moved to San Antonio and received her Juris Doctor from Saint Mary’s University School of Law in San Antonio, Texas in 2016.
Amanda E. Carollo
Amanda Esparza Carollo was born and raised in Laredo, Texas. She attended Wellesley College in Wellesley, Massachusetts, where she majored in Neuroscience. Prior to attending law school, she worked at Dechert LLP in New York City for several years focusing on complex product liability litigation. She received her law degree in 2011 from Albany Law School in Albany, New York.
Michael D. Joy, II
Michael Don Joy, II, was born in Corpus Christi, Texas, and raised in South Texas. Michael attended St. Mary’s University at San Antonio, where he graduated summa cum laude in 2001, with a Bachelor of Arts in Political Science. Michael received his Juris Doctor from Baylor University School of Law in Waco, Texas, in 2004.
Michael A. Dial
Michael Dial was born in Moore, Oklahoma. He became a registered radiologic technologist and performed imaging in hospital emergency and surgery departments before transitioning into the legal field. He received his Juris Doctor, summa cum laude, from Oklahoma City University School of Law in 2017.
Vanessa E. Valdez
Vanessa Valdez is a native of San Antonio. She attended The University of Texas, where she graduated with a B.A. in 2000. Before attending law school, she lived in Washington D.C. where she completed an internship program at American University and clerked for the United States Department of Education Office for Civil Rights.
Esther Mahon Marks
Ms. Marks was born in County Galway, Ireland and moved to New York with her family as a child. She has been with the firm for over 30 years and has been a Legal Administrator since 1992. Ms. Marks is responsible for the day to day operations of the firm as well as the responsibility for staff personnel.
Esther enjoys traveling, dancing and Pilates.