Sandra Schwarz was born in Mexico City to American and Hungarian parents. She came to the United States to further her violin studies at Oberlin Conservatory of Music, where she received her Bachelor of Music degree.
After being a member of symphony orchestras in Dallas, Hartford, Baltimore, and Vancouver, British Columbia, she decided to live and work in Seattle. For a number of years, she was concertmaster of the Northwest Chamber Orchestra and taught at the Cornish Institute. After moving to Bainbridge Island, she founded the Bainbridge Island Chamber Music Festival, which gave summer concerts for several years, and she also served as conductor of the Bainbridge Orchestra.
As a baroque and classical violin specialist, she was concertmaster of the Portland Baroque Orchestra for 14 years. Schwartz is also a former member of the American Bach Soloists and the Seattle Baroque Orchestra.
She continued her love of chamber music with the Tomasini String Quartet and the Iris Quartet, originally was a classical string quartet but now a flute quartet with flutist Janet See. In 2005, Sandra returned to her native Mexico, where she resides in Oaxaca and commutes to the Bay Area to perform with Philharmonia Baroque Orchestra.