Martha E. S. Morgan (1840-1899) was born in Surry, Maine, and died in Portland, Maine. She worked as a housekeeper and cook for Mary Baker Eddy, most notably in her home at 385 Commonwealth Avenue in Boston, Massachusetts, and in her Pleasant View home in Concord, New Hampshire. A student of Eddy's, Morgan completed the Primary class in March 1886 and then stayed to help with housework. She 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. . She was a member of the Christian Scientist Association. After 11 years of service, Eddy abruptly asked Morgan to leave her home in December 1897, and she was sent back to Portland. The next year, Eddy asked William B. Johnson, first Clerk of The Mother Church, to remove Morgan's name from the list of First Members and to put her on the general list of members. Eddy referred to Morgan as a "warning to others" when it came to the effects of mesmerism. Even so, Morgan remained a Christian Scientist until her death.

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