ScottBall_CAST_Tech_High_School_SAISD_HURD_HEARD_David_Will_ATT_11-27-2017-4

Tech Bloc CEO David Heard addresses students of CAST Tech High School.

Tech Bloc CEO David Heard addresses students of CAST Tech High School. Credit: Scott Ball / San Antonio Report

Tech Bloc CEO David Heard addresses students of CAST Tech High School during the announcement of a $95,000 grant from AT&T for a mentorship program at CAST Tech.