In 1966 he completed the degree of sivilingeniør (equivalent to Bachelor of Science) with a dissertation in the area of theoretical physics under the supervision of Harald Wergeland.

in theoretical physics, while completing his national service at Forsvarets forskningsinstitutt, working with the effects of electromagnetic pulses (EMP) from atomic explosions.

There, in collaboration with Richard Feynman, he developed a relativistic model of quarks which led to the second doctoral degree of Ph.D. in 1971.

There he gave a series of lectures on the relatively new topic of the renormalization group,[2] which were widely distributed.

Together with Alex Hansen he provided the natural explanation of the Klein paradox by including the effects of antiparticles from the Dirac equation[3] In 2012 he retired to the status of professor emeritus, and has made major contributions to the Norwegian Wikipedia in the areas of physics and mathematics.