Gertrude O'Brien was active/lived in California. Gertrude OBrien is known for Portrait painter.
While in San Francisco in the 1890s, O'Brien studied at the Mark Hopkins Art Institute. Exh: Calif. State Fair, 1899; Calif. Society of Artists, 1902.
Source: Edan Hughes, author of the book "Artists in California, 1786-1940"Nearly 20,000 biographies can be found in Artists in California 1786-1940 by Edan Hughes and is available for sale ($150). For a full book description and order information please click here