Our Coaching staff

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Varsity Head Coach

Coach Jaime Sierra was born in Mexico City and moved to San Antonio, TX at the age of 12. He attended San Antonio Reagan High School and was a 2 year Varsity Basketball Letterman and a National Merit Scholar.

After graduating from Reagan, Coach Sierra attended UTSA and earned a bachelor's degree in Kinesiology. 

Upon graduating from UTSA, Coach Sierra returned to his alma mater and joined the basketball staff.

In his time at SA Reagan, Coach Sierra served as a Strength & Conditioning Coordinator and a Defensive Coordinator for the Varsity team. In 8 years, he helped lead teams to 3 district championships, 7 playoff appearances and a school record 32 wins and regional tournament appearance in the 2021-22 season. 

The Vipers had a successful first year under Coach Sierra. The 2022-23 Vandegrift Vipers had a 22-13 record and clinched a playoff appearance. The 22 wins were more than the previous 2 seasons combined and also included multiple wins over top 10 ranked 6A opponents.

Coach Sierra has been married to his wife Breanna for 10 years, and they have 3 beautiful children Emma (6), Luke (4), Abby (1).

JV Head Coach & Varsity Assistant Coach

Coach Walling is entering his sixth year of coaching and his third year at VHS, where he will be Assistant Varsity and Head Freshmen coach. Coach Walling spent his first three years as Assistant Boy's Basketball Coach at Langham Creek HS in Houston. Before that, he spent 2 years as a Graduate Assistant Manager with the University of Texas Women's basketball team. He has a Bachelor's Degree in History from Angelo State University  where he also played on the basketball team, and a Master's Degree in Sports Management from the University of Texas. 

Coach Walling is originally from San Angelo, TX and is a graduate of Wall High School.