Brian John Peter Ferneyhough (/ˈfɜːrnihoʊ/; born 16 January 1943) is a British 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, San Diego, and currently, Stanford University, and is a regular lecturer in the summer courses at Darmstädter Ferienkurse.
Ferneyhough was born in Coventry and received formal musical training at the Birmingham School of Music and the Royal Academy of Music from 1966–67, where he studied with Lennox Berkeley. Ferneyhough was awarded the Mendelssohn Scholarship in 1968 and moved to mainland Europe to study with Ton de Leeuw in Amsterdam, and later with Klaus Huber in Basel.