Keith Ciancia, better known as Keefus Green or Keefus Ciancia is an American musician, composer and music producer. He has won an Ivor Novello Award and been nominated for an Emmy. Along with his long time creative collaborator, T Bone Burnett, he has co-composed and produced several film and television soundtracks, including the HBO series True Detective and the Coen brothers' The Ladykillers. He has produced records for a variety of artists including Kimbra, Everlast, A Fine Frenzy, Étienne Daho, Nikka Costa and Cassandra Wilson. As a keyboardist and pianist he has performed with Mike Patton, Marc Ribot, Iggy Pop, Father John Misty, Elton John and T Bone Burnett. He also co-produced and co-wrote Sleeping Tapes with Jeff Bridges.
Ciancia was the keyboardist for Everlast, with whom he wrote and produced the Emmy nominated theme song for the TNT series Saving Grace. In 1993 he met his wife, singer Jade Vincent, and together they formed the ten piece experimental big band, The Jade Vincent Experience which later became Vincent & Mister Green. They were signed to Mike Patton's label, Ipecac Recordings and have composed and recorded music for a variety of films and television series and specials including Divine Secrets of the Ya-Ya Sisterhood, Killing Eve, and Baby Driver.
Ciancia has one daughter, writer Raven Violet Ciancia-Vincent, and lives in France where he and Jade continue to write, record and perform music together.