Ritchie (1922-2015) was an enormously important Appalachian singer and songwriter. She was friends with the Seeger family. She was largely responsible for popularizing the lap dulcimer in folk circles around the U.S.
Biographical article: https://blogs.loc.gov/folklife/2015/06/jean-ritchie-1922-2015/
Archival photographs of Ritchie during her artist in residency at UC Santa Cruz in 1978