Student, Real University, Bergen, Norway, 1968. Doctor of Philosophy, University Michigan, 1971.
Senior research engineer Det Norske Veritas, Oslo, 1968—1974. Associate professor Norwegian Institute of Technology, Trondheim, 1974—1976, professor marine hydrodynamics, since 1976, chairman marine technical department, 1982—1984. Board directors Marintek, Trondheim.
Visiting professor Massachusetts Institute of Technology, Cambridge, 1980—1981, 1987—1988. Chairman standing committee PRADS.
Member of National Academy of Engineering (foreign associate member), Norwegian Academy of Sciences & Letters, Norwegian Academy Technology Science.
Married Bente Owren, April 9, 1966. Children: Vidar, Ingunn, Stig.