Upon completing a Master’s Degree in Childhood Education, he spent several years teaching in New York City Charter Schools. Through intensive academic interventions, he successfully closed the achievement gap by large margins each year in literacy and math while serving in low-income communities. After demonstrating leadership and delivering consistent high academic results in the classroom, Mr. Mattison was promoted to serve as an Assistant Principal in a Bedford-Stuyvesant Charter School. During this time, he also obtained a Master’s in Educational Leadership and Administration and his New York State School Building Leadership and School District Leadership Certifications. After years of successful results, Mr. Mattison was assigned to serve as Principal of The Academy Charter School in Hempstead, New York. There he led a team that helped students make unprecedented academic gains. During his six years as Principal, the school outperformed the Hempstead School District by 45+ percentage points each year on the NYS ELA and Math Exams. He also helped the organization scale up to K-12 and replicate to serve other high needs communities. Under his tenure, the school was recognized by the New York State Dept. of Education as a reward school for high achievement and high progress. Mr. Mattison was also appointed to serve as the Senior Network Principal.