"During the quartet's history, the membership changed completely. In 1927 Joseph Roisman joined as second violin, becoming the leader within a few years. It was under Roisman that the quartet became internationally famous on both sides of the Atlantic. After extensive tours of Europe the players settled in the USA in 1938. From that year until 1962 they were quartet-in-residence at the Library of Congress, Washington. In 1962 they moved to a similar post at the State University of New York, Buffalo. During this period they continued to undertake world tours, becoming especially renowned for their interpretations of Beethoven’s quartets, which they performed in their entirety almost every year, and which they recorded three times." Robert Philip in Grove Music Online
"During the quartet's history, the membership changed completely. In 1927 Joseph Roisman joined as second violin, becoming the leader within a few years. It was under Roisman that the quartet became internationally famous on both sides of the Atlantic. After extensive tours of Europe the players settled in the USA in 1938. From that year until 1962 they were quartet-in-residence at the Library of Congress, Washington. In 1962 they moved to a similar post at the State University of New York, Buffalo. During this period they continued to undertake world tours, becoming especially renowned for their interpretations of Beethoven’s quartets, which they performed in their entirety almost every year, and which they recorded three times." Robert Philip in Grove Music Online