Brian John Peter Ferneyhough (/ˈfɜːrnihoʊ/; born 16 January 1943) is an English composer, who has resided in California, United States since 1987. His work characterized by highly complex notation and the extensive use of irregular nested rhythmic tuplets, Ferneyhough is typically considered to be the central figure of the New Complexity movement. Ferneyhough taught composition at the Hochschule für Musik Freiburg and the University of California at San Diego, and currently, Stanford University, and is a regular lecturer in the summer courses at Darmstädter Ferienkurse.