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Mark began his career in education as a 1999 corps member with Teach For America teaching 5th grade at Garcia Elementary in the Houston Independent School District (HISD). Inspired by founder Chris Barbic’s vision, Mark left his position at HISD in 2001 to join YES Prep—at the time, a small charter school in southeast Houston. Four years later, Mark became the School Director of the first replication site—YES Prep North Central. Under Mark's leadership, YES Prep North Central earned the state's highest ranking of Exemplary every year, received the national EPIC award, and was named a National Blue Ribbon school. In 2010, Mark joined the YES Prep Head of Schools team to manage all YES Prep campuses. From 2011- 2013, he served as the Vice President of Operations and Growth before moving into the role of Superintendent for the next three years. During his time as Vice President and Superintendent, Mark executed YES Prep's growth strategy and surpassed their vision to serve 10,000 Houston children. For his unwavering commitment to educational equity and undeniable results, the Board of Directors named him Chief Executive Officer in April 2016.