Calvin A. Frye (1845-1917) first studied Christian Science with Mary Baker Eddy in 1881 and subsequently took two more classes with her. Beginning in 1882, he worked for Eddy for over 28 years, serving as her personal secretary and in many other roles, including confidant, coachman, practitioner, and household manager. He kept meticulous financial account books for her households and for his personal accounts. He was one of the First Members of The Mother Church, later known as "Executive Members," who was one of twenty elected to join the original twelve members of the church when it was formed on September 23, 1892. After Eddy's passing, he served a term as President of The First Church of Christ, Scientist, Boston, Massachusetts, in 1916. He also traveled extensively and continued his photography hobby.

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