Mary B. Bull (1851-1930) was born in Quincy, Illinois, and died in Cedarville, Michigan. She lived in Quincy her whole life, first with her parents, and after their deaths, with her sister Elizabeth G. Parker (b. Bull). Her father, Lorenzo Bull, Jr., was a prominent merchant, banker, railroad financier, and philanthropist in Quincy. In January 1886 Bull studied Christian Science with Ellen Brown Linscott, a student of Mary Baker Eddy, and she then took Eddy's Primary class in January 1887. Bull joined The First Church of Christ, Scientist, in Boston, Massachusetts, on June 3, 1910, and was also a member of the First Church of Christ, Scientist, Quincy, Illinois. In the 1920s Bull served as the secretary of the Adams County Historical Society and was a founding member of the Quincy Art Club. When she died, she willed $25,000 to Cheerful Home Daycare which her parents helped found in 1886 to care for the children of working mothers. It was one of the first establishments of its kind in the United States. Bull passed away while visiting Cedarville.

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