Quivver is producer, vocalist and songwriter John Graham. He also uses the aliases Skanna, Stoneproof and Space Manoeuvres - Skanna for drum and bass, Stoneproof for house and Space Manoeuvres for trance. He is a former member of 90's production team Tilt and has previously worked with Hybrid, notably as a guest vocalist on the "I Choose Noise" album.
In 2005 he takes part for the Planet Funk album as vocal member.
In 2006, Graham appeared on progressive house/breaks act Hybrid third LP, I Choose Noise as a vocalist. Graham has also toured with the group as a semipermanent vocalist, along with Charlotte James.
In 2008, Graham's album under the Quivver name, Dirty Nails & Vapour Trails was released on Critical Rhythms.