Brian Ferneyhough 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 fur Musik Freiburg and the University of California, San Diego, and currently, Stanford University, and is a regular lecturer in the summer courses at Darmstadter Ferienkurse.