Prominent Education Reformer of the 19th Century

During the early 19th century, a diverse range of reform movements emerged in the United States aimed at improving various aspects of society. These movements addressed issues such as education, women's rights, abolition of slavery, and temperance. One significant reform that aimed to improve public education and make it accessible to all children was championed by individuals who believed in the importance of having a literate and educated citizenry. Who was the prominent education reformer known for advocating for free public education during this period?