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.
Coach Mouser is starting his 14th year as a coach and teacher. He has been a coach for 10 seasons at VHS after spending his first four years working for Temple ISD as a high school and middle school coach. This will be his 7th year with the VHS basketball program and is proud of his back to back 2018-19 and 2019-20 Freshman B Team district titles, followed by his most recent Freshman B team district title in 2022-23.
He married his wife, Jennifer, in June of 2020. They live in Leander with their dog Sarge. As a couple, they have a goal of going to a baseball game at each of the major league ballparks and so far have checked off 8! Outside of coaching, Coach Mouser enjoys spending time with family, travelling and playing golf. He and Jennifer have added a baby girl named Ellie to the family this year!
Coach Mouser teaches Economics as well as being the Offensive Coordinator for the 2022 6A state runner-up Vandegrift High School Football program.
Vandegrift HS Boys Basketball Booster Club
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