Mary Adell Seymour (b. Smith) (1845-1913) was born in Tioga, New York, and died in Nichols, New York. She married Herrick H. Seymour, a farmer, in 1866, and they lived in Owego, New York, settling in Nichols sometime before 1900. She became interested in Christian Science in late 1884, and studied with Ellen E. Cross, one of Mary Baker Eddy's students. Seymour then became one of Eddy's students herself, completing the Primary class in November 1887 and the Normal class in February 1887. She was active in the Women's Christian Temperance Union, serving as the president of her local chapter in the early 1900s.

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