Short answers, pulled from the story.
Joseph Zoellner established the quartet in Brooklyn, New York during 1903 or possibly 1904. The group operated a music school there while his family lived in Stockton, California from the founding until 1906.
Antoinette Zoellner died on the 11th of March 1962 after sharing a residence in Los Angeles with her father and brother Joseph Jr. Amandus Carl Zoellner played second violin until his death the 14th of June 1955, and founder Joseph Zoellner died the 24th of January 1950.
During the 1916, 1917 season the quartet crossed paths with Helen Keller and Anne Sullivan in Oklahoma City to determine if she could sense vibrations. They played Tchaikovsky's String Quartet no. 1 in D Major op. 11 second movement as she swayed in time alternately crying and smiling.
Arthur Farwell wrote String Quartet The Hako in 1922 at Joseph Zoellner's suggestion while Charles Sanford Skilton dedicated Two Indian Dances to them premiering them in January 1916. Eugene Goossens composed a quartet programmed during their Eastern US tour in early 1919 and Roy Harris premiered Impressions of a Rainy Day suite on the 15th of March 1926.
The original quartet left six sides issued as Edison diamond discs plus three recorded for Columbia all comprising isolated movements rather than complete works. Notable releases include Boccherini Minuet from Quintet in E op. 13 no. 5 issued the 1st of November 1920 and Haydn Adagio Cantabile from Lark Quartet released April 1921.