Who was the prominent proponent of public school reform and the Secretary of the Massachusetts Board of Education?

The prominent proponent of public school reform and the Secretary of the Massachusetts Board of Education was Horace Mann. He is often referred to as the "Father of the American Public School System" due to his significant contributions to the establishment and improvement of public education in the United States during the 19th century. Mann advocated for universal access to education, the training of teachers, and the professionalization of teaching as a career. He believed that education was a fundamental right for all children and that it was essential for a healthy democracy. His efforts laid the groundwork for the public education system that expanded throughout the country, making it more accessible and better organized.