Mary Kimball Morgan (8 December 1861 – 13 October 1948) was an American educator and the founder of The Principia, a K–12 school in St. Louis, Missouri, and Principia College, a four year college in Elsah, Illinois.
Nellie May Kimball, who went by Mary, was born in Janesville, Wisconsin on December 8, 1861.
[1][2] Her family moved to St. Louis when she was six years old, where she went to school and was active in the Methodist Church.
She married William Edgar Morgan in December 1885, but her health continued to decline rapidly.
[5] She began homeschooling her two sons, and soon was asked by other parents at her church to teach their children as well.