Siri Berg (1921–2020) was born in Stockholm, Sweden. She immigrated from war-ravaged Europe to the United States at nineteen years old. Her intense interest in color was formalized by studying with Austrian born Zita Querido—a former student and colleague of Hans Hofmann—at the Riverdale Fine Arts Society in New York. Color was a life-long passion, enhanced by Berg’s strong interest in the works and ideas of Johannes Itten and Josef Albers: she in fact taught Color Theory at the Parsons School of Design for more than thirty years.
While most of the letters discussed issues regarding psychiatry, Jung appeared to be intrigued by the Hebrew language and Jewish texts in some of the letters.