Reminiscences of forty years of friendship with Hans Eysenck and collaboration on work on racial and national differences in personality and intelligence

•The author's reminiscences of forty years of friendship with Hans Eysenck•Summarising collaboration on work on racial and national differences in personality•And on intelligence

This paper summarises the author's friendship and collaboration with Hans Eysenck over forty years with particular reference to their work on racial and national differences in personality and intelligence and its subsequent development by the author and others. Eysenck was one of the first to accept a genetically based black-white difference in intelligence. Later work has developed this further by documenting IQs for all races.