Poul Christiansen trained at the Royal Danish Academy of Fine Arts' School of Architecture.
He worked in architecture and design for Ib & Jørgen Rasmussen from 1977 to 1986. He founded "Komplot Design", together with Boris Berlin in 1987.
Between 1969 and 1987 Poul Christiansen brought innovative and exciting dimensions to LE KLINT's lamp shades. Prior to his involvement the shades had been folded in pleats and in straight lines across the pleats. Poul Christiansen discovered that folding in mathematical curves gave the lamp shades beautiful and unique sculptural shapes.
His most famous creation is the SinusLine series, which he developed by combining sine curves in such a way that they formed a lamp shade when folded. Poul Christiansen continues to design new lamps for LE KLINT.