David Marquez serves as the Executive Director for Bexar County. In this position, he directs the County's efforts to develop and improve the local economy. This is achieved through domestic and international business development programs, the Tax Phase-In Incentive program, and various other initiatives. Mr. Marquez most often works as a team member with the other economic development agencies around the community.

Since 2000, Mr. Marquez has also been the County's manager for the negotiation, construction and on-going operations of the AT&T Center, home to the NBA Champion San Antonio Spurs, and to the annual San Antonio Livestock Show and Rodeo. The project also includes several other planning and development components for the area in and immediately surrounding the Arena site.