Peter Opsvik is a Norwegian industrial designer best known for his innovative and ergonomic chairs, and the father of Jazz bass player Eivind Opsvik. Opsvik's furniture can be found under the brand names: Rybo (Garden), Nomi High Chair, Håg (Capisco, H04, H05, Conventio Wing), Varier, Stokke (Tripp Trapp) Naturellement (Reflex), Cylindra (Furniture objects) and Moment (Globe). His book Rethinking Sitting came out in 2009 giving insight into his thinking about sitting and explaining the philosophy behind his chairs. Peter Opsvik is also a jazz musician. He has been a member of Christiania Jazz band from 1972 and the band Christiania 12 from 1993.