Avelardo Valdez, University of Houston (IMAGE) University of Houston Caption UH Professor Avelardo Valdez leads an NIH funded longitudinal study on San Antonio gang members. Credit Tom Shea/University of Houston Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.