Master of Science in Engineering Physics, Royal Institute of Technology, Stockholm, 1957. Doctor of Philosophy, Royal Institute of Technology, Stockholm, 1963.
Professor solid mechanics, head department Royal Institute of Technology, Stockholm, 1964—1988, head department strength of materials and solid mechanics, 1966—1987, president, 1988—1999, Royal Swedish Academy of Sciences, Stockholm, 2000—2003. Member board Jt. Research Center of European Union, 1993—2001. Chairman board Swedish Council for Cooperative with European Union, 1993—2001, Swedish Defense Research Laboratories, 1993—2001, Malardalen University College, since 1998.
Board directors Knut and Alice Wallenberg Foundation, since 2001.
Member of Royal British Academy Engineering Sciences, Royal Swedish Academy of Sciences, Royal Swedish Academy Engineering Sciences.
Married Solvig Carlsson.