University of Oslo.
He took the candidate.real. at the University of Oslo in 1972 and took the dr.philos. degree at the University of Trondheim in 1994. He was then appointed as a professor of theoretical physics at the Norwegian University of Science and Technology. He had then worked at the Norwegian Institute of Technology since 1985, except the years 1987 to 1990.
Together with Jon Magne Leinaas he has made important discoveries on anyons.
The duo shared in Science in 1993.