Even with eleven years learned to play the guitar Crispian. At 15, he came to Richmond College, where he met bassist Alonza Bevan. The two soon discovered their common musical interests and began to make music together. They named their band Object of Desire, later mantra hack. 1991 met the drummer Paul Winter Heart to the band. In 1993, Mills decided to go to India, where he worked in a temple. Here he came up with the idea to combine classical Indian music with rock music. Impressed by the temple chants he also decided to incorporate Sanskrit words in his lyrics. After his return in 1993, the band engaged the organist Jay Darlington and changed its name to Kula Shaker. The band was later signed a contract with Columbia Records. In 1996 with "K " is the first album of the group, which was to be their biggest success at the same time.
After Kula Shaker had dissolved, Mills experimented with new musical ideas. This ultimately ended in the formation of the band The Jeevas with Andy Nixon and Dan McKinna. Their first album was a success in Japan, but not in the UK or Europe. The Jeevas split up in 2005. In January 2006, Kula Shaker announced officially that the band had re-formed.
2012 appeared the comedy The terrible fear of the terrible ones with Simon Pegg in the lead role, acted for the Mills as a screenwriter, director and producer.
He is married to the model Jo Mills (born Branfoot ). In July 2008, Mills ' first son, Keshava was born. He lives in Bath, England.