Isabel Grenfell Quallo (4 April 1893 – 21 September 1985) was a Congolese-born British-American domestic worker and community activist known for her involvement in the development of Druid Heights, in Marin County, California. Born in the Congo Free State, she was educated in England and then moved with her mother to Kingston, Jamaica. Marrying at 16, she immigrated with her husband to New York City in 1914. Struggling with racism and her husband's mental illness, she supported her children by working as a domestic and waitress. Through contacts in the theater district, she made the acquaintance of writer Elsa Gidlow, becoming her partner for more than ten years. While living in California, the women worked with builder and jazz musician Roger Somers, and his wife Mary, to create the bohem