Gustavus F. Walker (1843-1915) was born in Hodgdon, Maine, and died in Boston, Massachusetts. He was a Civil War veteran, who, after the war, studied medicine at Boston University and Vermont Medical College, Rutland, Vermont. After completing his studies, he set up a homeopathic practice at 548 Tremont Street in the South End neighborhood of Boston. There is no record of Walker studying with Mary Baker Eddy or uniting with the Church of Christ (Scientist).

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