Horace Mann is recognized for his significant contributions to education reform in the United States. Often referred to as the "Father of the American Public School System," Mann advocated for free, universal, and non-sectarian public education. His efforts in the mid-19th century focused on improving school conditions, teaching standards, and teacher training. Mann believed that education was essential for a democratic society and worked to establish normal schools for teacher preparation. His vision laid the framework for modern educational systems and the importance of public schooling.