[3] Thacher worked as an editor at The New Church Messenger, a Swedenborgian publication based in New Jersey, and The New Earth, before her marriage in 1893.

Working with her husband, she was managing editor of The Public, a political weekly based in Chicago and in New York, from 1893 to 1913.

[10] She addressed a meeting of the Women's Single Tax League of Washington in 1913, proposing that suffrage laws should consider the rights of children to representation at the ballot.

[11] She was an American delegate to the International Congress of Women in 1915 when it was held at the Hague,[12] and in 1919 when it was held in Zürich; she also attended the 1924 meeting of the Women's International League for Peace and Freedom (WILPF) in Washington, D.C.[1] Alice Thacher married widower Louis F. Post in 1893.

[1] Anna George de Mille wrote a tribute to the Posts, as "Partners in the truest sense, these two great people lived gently and bravely, asked little and gave much.