Houghton Mifflin Harcourt
Harcourt: Biographies: Dorothea Dix 1802 1887
Best know for her work with the mentally ill. Dorthea Dix also was very involved in the work of prison reform. Here, you can read her fascinating life story.
Smithsonian Institution
National Portrait Gallery: American Women: Dorothea Dix
Contains a portrait and brief biography of Dorothea Dix.