In 1870, the American Presbyterian missionary Rev. George Whitehill Chamberlain and his wife Mary Annesley founded a private grammar school inside their home. The classes were held in their living room and, a few years later, the "American School" was established as a center of excellence in São Paulo. The Chamberlains' American School was revolutionary for the Brazilian standards at that time: no corporal punishment on students was permitted, and both boys and girls could attend classes. Even though the Chamberlains were openly Presbyterians, students from all ethnic backgrounds, social classes, and religious denominations were welcome. The fame of academic rigor allied to religious tolerance soon reached the United States.