Through Hill, Henrietta met
Canon Samuel Barnett, then the curate of
St Mary's, Bryanston Square. They married in 1873. The newlyweds soon moved to the impoverished
Whitechapel parish of St Jude's, intent on improving social conditions. Henrietta continued her parish visiting activities, with a focus on women and children, including the more than 2,000 prostitutes then active in Whitechapel alone. becoming the Children's Country Holidays Fund in 1884. Henrietta Barnett promoted Homes for Workhouse Girls starting in 1880, and founded the London Pupil Teachers Association in 1891. She also served as vice-president of the National Association for the Welfare of the Feeble-Minded (1895) and
National Union of Women Workers (1895–96), as well as Hon. Secretary of the
State Children's Aid Association. In 1884, the Barnetts established (and began living at)
Toynbee Hall, a pioneering university
settlement named after the recently deceased distinguished historian
Arnold Toynbee, who had advocated education of the working classes and reduction of the division between social classes. In 1897 annual loan exhibitions of fine art began at the nearby
Whitechapel Gallery through the Barnetts' efforts. In 1903
Richard Tawney began working with them, the Children's Country Holiday Fund, and the
Workers' Educational Association.
William Beveridge and
Clement Attlee also worked with the Barnetts as they started their own careers. A visit to Toynbee Hall inspired
Jane Addams to found Hull House in Chicago. In 1889 the activist couple acquired a weekend home at Spaniard's End in the
Hampstead area of north-west London. The Barnetts became inspired by
Ebenezer Howard and the model housing development movement (then exemplified by
Letchworth garden city). Building on the principles of Toynbee Hall, Henrietta had a vision of a garden community where all classes could live together in a light and airy environment, with beautifully designed housing and gardens, as well as protecting part of nearby Hampstead Heath from development by Eton College. She began by establishing a committee to protect part of nearby
Hampstead Heath from development by
Eton College, raising £43,000 and purchasing 80 hectares of the Heath for the public. In 1909, an adult education institute opened in the middle of the new Hampstead Garden Suburb, with cultural programmes and discussion groups. Soon a school for girls was established and named the
Henrietta Barnett School. ==Writing==