[1] She served as patronal president, Woman's Land Army of America, 1918; and as first vice-president, National War Work Council of the Young Women’s Christian Association (YWCA).

As a clubwoman and as a Vice-Chair of the Sulgrave Endowment Committee of the National Society of the Colonial Dames of America, she demonstrated an aptitude for organization and financial acumen as well as the sympathetic training in living together.

On leaving school, Brown spent a winter in Vienna, to continue the musical instruction begun under Karl Klauser at Farmington.

This visit, though brief, constituted the turning point in Brown’s life and the impressions received there controlled her interests and activities for many years.

[2] On March 30, 1892,[3] she married William Adams Brown, Ph.D., D.D., of New York, clergyman, author, professor, Fellow of Yale University and patron of the Metropolitan Museum of Art.

Her gift of drawing many women together for joint effort found its fullest scope and, as a result of the harmony which existed among its leaders, the Cosmopolitan Club was soon established in unique and attractive quarters, with an enviable reputation and adequate financial resources.

With Mrs. Herbert Lee Pratt, Mrs. Francis McNeil Bacon and others, Brown reported at headquarters to General John J. Pershing, Commander-in-Chief of the U.S. Army, on the work carried on by the YWCA for the women connected with the U.S.

In order to aid the farmer to obtain additional seasonal labor at a moderate price and thereby facilitate increased food production, an emergency organization of women was formed called Woman's Land Army of America.

Many farmers were ready to accept gratefully the help they offered; and the capacity of women to perform efficiently various sorts of farm work was well demonstrated.

The possibilities of a career in agricultural work were set before the minds of a large number of young women, who, after the close of the war, chose to devote themselves to such pursuits.

Brown made speaking tours throughout the country and pleaded for continued support of the work conducted by the YWCA, for self-supporting young women.

[2] The family lived at 49 East 80th Street in New York City and had a summer home on Mount Desert Island in Maine where they befriended many prominent people, including Charles William Eliot, president of Harvard University, Seth Low, president of Columbia University and later Mayor of New York City, and John D. Rockefeller Jr. Brown was deeply attached to her summer home "The Tree-Tops" at Seal Harbor, Maine, where she lived since 1900.