Asscher was born in the Netherlands. His family was of Jewish heritage; they were thus deported to
Westerbork transit camp, from where his mother secured their release in 1943 by fabricating claims to be of English descent, helped in part by her son's blond hair. The family left the Netherlands in 1947, when his father obtained a position with
Shell in London. He died from bowel cancer on 20 July 2014. An obituary was published in the
British Medical Journal. == Career ==