Background
He was born in Nes i Hallingdal.
He was born in Nes i Hallingdal.
He took his dr.philos. in 1986 and became professor at the University of Oslo in 1994. He is also assisting professor at the University of Tromsø. His most notable works include Cognitive Development in Infancy (1989), Spedbarnsalderen (1991, with L Smith), Lettvektere: om for tidlig fødte barn (1992) and Forstå barnet ditt (three volumes, 2002-2007).