“Conceived in 1946, the Juilliard quartet gave its first official performance the next year. Besides Mr. Mann, the original roster included the second violinist Robert Koff, the violist Raphael Hillyer and the cellist Arthur Winograd. Mr. Mann – for decades the quartet’s de facto spokesman, institutional memory and ‘resident spark plug,’ as the Chicago Tribune called him in 1997 – remained with the ensemble for 51 years.”