In 1879, Sara, with her daughter and mother, moved to Cambridge, Massachusetts and lived in a rented house called "Elmwood".

[2] Two years later, Ole purchased a summer house in West Lebanon, Maine and named it "Ironwell".

Their house was the center of intellectual activities in which leading intelligentsia, artists and philosophers of Harvard University, like William James, George Santayana, Josiah Royce, and many others were regular participants.

[6] After her husband's death in 1880, Sara wrote his biography titled Ole Bull, a Memoir, which was published in 1882.

Having acquired an interest in Norway, her husband's place of birth, she participated in activities of the Scandinavian community.

[6] Swami Saradananda (Sharat), disciple of Ramakrishna Paramhansa, who came from India, started working in New York City to help Vivekananda and Sara.

Sara regularly sent money to Ramakrishna’s disciples visiting the Belur Math monastery to provide a home for their stay.

She supported Jagadish Chandra Bose in his scientific research, and when he was sick in London in 1900, she paid for his treatment.

[13] Sara held Sarada Devi, the spiritual consort of Sri Ramakrishna reverentially and was primarily responsible for getting her photographed during her visit to India in 1898.

She developed friendship with Kakuzo Okakura, the Japanese scholar and artist, and she had stayed with him during her visit to Japan.

[13] Sara Bull conceptualized and promoted the idea of Cambridge Conference where she had invited many noted speakers like William James, Jane Addams, Julia Ward Howe among others.

[15] She had a close relationship with Sarah Farmer who was a founder of the Greenacre Conference for promoting inter faith harmony and universal tolerance.

[16] According to Pravrajika Prabuddhaprana, her biographer, she did not come under the influence of any other sect other than her allegiance to the Vedanta philosophy as she had hated sectarianism and occultism throughout her life.

[12] So the Rajah Yogi sect may have been a reference to the Vedanta Society established by Swami Vivekananda as he wrote the book titled Raja Yoga.

Funeral service was held at the home of E. A. Grosser where her husband's compositions, "Adagio Religiose" and "Saterdesog" were played.