 As a member of the quartet, Cohen also served on faculty at Juilliard from 1958 to 1966.In 1968, following the retirement of violinist Daniel Guilet, he was persuaded to join the Beaux Arts Trio by pianist Menahem Pressler and cellist Bernard Greenhouse.By the mid-1970s they were touring and recording as the world's best-known and busiest piano trio.