[2][3] She was married to Thomas M'Clintock and they were both invested in their Quaker backgrounds, and social reform.

[4] Once moved to Waterloo, Mary Ann took a more active role in the women's suffragist movement.

Mary Ann had a hand in organizing the Seneca Falls Convention, held in July 1848.

She and her daughters Elizabeth and Mary Ann also attended the convention and signed the Declaration of Sentiments.

[4][5][6] The base of the convention was to present the Declaration of Sentiments, this document drafted by women such as Elizabeth Cady Stanton and Lucretia Mott at the kitchen table of Mary Ann M'Clintock and outlines equal opportunities among men and women.