Foster is an American folk singer-songwriter and musician living in USA.

For several years she worked as a singing teacher in Chicago, recording and performing with a variety of musical acts on the side including Born Heller, a duo with free jazz-bassist Jason Ajemian and The Childrens Hour a pop band formed with songwriter Andrew Bar. In 2004 joined by her occasional backing band The Supposed, Josephine released an album of psychedelic rock called All the Leaves Are Gone.