An American author and feminist, she is best known for titles such as Woman's Work (1908) and The Basis of Marriage (1910). She co-wrote her 1906 work, Justinian and Theodora, with her soap salesman and philosopher husband.
She grew up in New York and worked as a schoolteacher in her early adulthood.
She was an important figure in the Roycroft arts and crafts movement.
She married Elbert Hubbard after giving birth to his illegitimate daughter, Miriam Elberta Hubbard. Tragically, both Hubbard and her husband died while traveling by sea to Europe to cover the events of the First World War.
She was born in the same year as fellow author and women's rights activist, Grace Hebard.