(Leslie) (b Chesterfield, June 15, 1947). English composer. After studying composition with Stoker at the RAM (1964–8), he received private tuition from Bennett (1968–70) and Lutyens (1967–70). He has taught at the RAM as Manson Fellow and lecturer (1969–86) and head of composition and contemporary music (1985–97). He came to attention with a Stravinskian Trumpet Concerto (1969); however, friendships with Polish composers, in particular Penderecki, Lutosławski and Stachowski, led to a radical change in direction apparent in Kyrie (1972) and Time Piece (1973), in which he adopted the graphic notation and textural techniques of the Polish school. These formative influences dominate Patterson's music of the 1970s, exemplified by the Requiem (1975), Clarinet Concerto (1976), Cracowian Counterpoints (1977, rev. 1978) and the large-scale choral work Voices of Sleep...