In addition to her work in the New York suffrage movement, she helped to found the National League of Women Voters.

After teaching for a year in Dayton, Ohio, she went to Europe, studying with Xaver Scharwenka in Berlin and Élie-Miriam Delaborde in Paris[4] between 1886 and 1889.

[4] By July 1889, she had returned to the United States,[6] joining the Chicago Conservatory of Music, where she taught and performed until 1896.

[7] In August 1893 Gertrude Foster married Arthur Raymond Brown (1865-1944), an artist and advertising executive who worked for the Chicago Evening Post.

[8] Gertrude Foster Brown continued to play and performed lecture recitals on Richard Wagner and his operas.

[19][1] It was published in February 1918 by Harper & Brothers,[2][3]: verso  and was endorsed by the New York State Women Suffrage Party.

[14][20][21] Dealing with civics "from the standpoint of the woman voter", women were encouraged to "regard their vote as a trust to be used not to advance partisan politics, but to further human welfare.

[10] Brown helped to found the National League of Women Voters, serving as chairperson of the group that drafted its organizational plan.

In 1945, she represented the committee at the founding United Nations Conference on International Organization in San Francisco, California.