The Berkshire String Quartet was an American classical chamber group founded and funded in 1916 at the height of World War I by Elizabeth Sprague Coolidge.
Kortschak was a key figure in organizing the Berkshire Chamber Music Festival founded by Coolidge.
She underwrote enough additional performances to make the quartet's summer season possible.
"[2] The quartet agreed and, at the urging of Wilfred Bain, moved its permanent residence to the Indiana University School of Music.
The quartet continued to maintain its summer residence at Music Mountain, a hilltop near Falls Village, Connecticut, where, in 1930, Gordon had founded a Chamber Music Festival named after the hilltop.