Calla S. Johnson (later Calla S. Willard) (c.1849-1939) was born in Lafayette, Indiana, and died in Rosemead, California. She was a teacher, working in Chicago public schools for twenty-five years until resigning from her position in 1900. After resigning, she moved to Lincoln, Nebraska, where she worked as a missionary for the Christian Woman's Board of Missions. Johnson was also an accomplished writer, contributing regularly to several Nebraska newspapers and authoring Life, Light and Love (1901). Although she expressed an interest in Christian Science and studying with Mary Baker Eddy, there is no record of Johnson studying with her or uniting with the Church of Christ (Scientist).

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