A proven leader and transformational coach, Coach Cortez brings over 22 years of experience training and developing young men and women—first in the military, now in youth endurance sports. As a former Command Fitness Leader for the U.S. Navy, he led thousands of Sailors and Marines through programs that emphasized discipline, resilience, and growth. Today, he brings that same focus and heart to coaching at Murrieta Valley High School. His style is structured but encouraging, holding athletes to a high standard while helping them build confidence, toughness, and character. For Coach Cortez, coaching is a calling and a way to give back by preparing the next generation to lead with strength, humility, and purpose. 

A lifelong athlete and passionate coach, John Tzinberg brings years of experience and heart to youth endurance sports. As Coach and Team Coordinator for Murrieta Valley HS XC Coach, The Time Machine Youth Track & Field / Cross Country team, and coach of the MVHS Middle School Mountain Bike Team, he's known for his tough, supportive style that builds both performance and character. Coaching is John's way of giving back, helping the next generation grow in resilience, confidence, and maturity. He's committed to developing not just strong athletes, but strong individuals for life.