 He often performed Schubert's String Quintet and the Sextets of Johannes Brahms with the Amadeus Quartet and other well-known quartets.William Pleeth was a professor of cello at the Guildhall School of Music and Drama in London from 1948 to 1978.From 1977 he was a visiting professor at the Yehudi Menuhin School and the Royal College of Music.