Doctor of Medicine, Uppsala University, Sweden, 1980. Doctor of Philosophy, Karolinska Institute, Stockholm, 1990.
Intern various hospitals, Uppsala and Enköping, 1980-1982. Resident St. Göran's Children's Hospital, Stockholm, 1982-1986, staff physician, 1987-1990. Chief hematology department pediatric hematology and oncology Karolinska Hospital, 1990—2004.
Associate professor pediatrics Karolinska Institute, 1993—2004, 1993—2004, professor clinical pediatrics oncology, since 2004. Consultant Karolinska University Hospital, since 2004, head research development & education, division pediatrics, since 2008. Chairman International Familial Hemophagocytic Lymphohistiocytosis Study Group, New Jersey, since 1993.
Board directors Swedish Physicians for the Environment, 1991—1995. Member Swedish Medical Association, Nordic Organization Pediatric Hematology/Oncology, International Society Pediatric Oncology, International Histiocyte Society (science committee 1992-1998), Histiocyte Society (board directors 1995—2008, president, 2004-2007), ICORD (president 2007-2008).
Married Maria Axelsson, October 5, 1979. Children: Gustav, Viking.