This information agrees with the first and last dates of Perolé Quartet events (concerts and broadcasts) reported in The New York Times between 1927 and 1942, a period of fifteen years.
In an interview with Dennis Rooney ("Traditional Values"), Lillian stated that she "joined the Perolé Quartet in 1925" and the "ensemble played together for 19 and one-half years."
To further complicate the data, the entry for Edgar Leventritt in The New Grove Dictionary of American Music states that "his support made possible the founding of the Perolé Quartet in 1925."
[3] Mankovitz was replaced as second violinist by Max Hollander in 1933, and Julian Kahn as cellist by Ernst Silberstein in 1937.
Coleman's departure in 1942 spelled the end of the quartet,[4] though according to Living Musicians it "was disbanded soon after World War II.