Sergio Lozano was born and raised in Laredo, Texas. He attended St. Edward’s University in Austin, Texas, where he graduated with honors in 1999. His passion for justice leads him to pursue a career in law. He attended St. Mary’s University School of Law in San Antonio, Texas, and graduated in 2002. In 2002 Sergio started his legal career at the Webb County District Attorney’s office as a prosecuting attorney under then District Attorney Joe Rubio. Quickly moving up the ranks at the District Attorney’s office, Sergio was promoted to Chief Prosecutor of the 49th District Court by current "District Attorney Isidro “Chilo” Alaniz".