several decades an important textbook. In Denmark Geiger began by gaining a scholarship from the Rockefeller Foundation through the "Instituttet for Historie og Samfundskonomie" in Copenhagen; later he gave lectures at the University of Copenhagen. From 1938 to 1940, he was professor of sociology at the University of Århus—Denmark's first ever professor of sociology. When German troops entered the city in 1940 he was forced to leave, escaping to Odense where he lived with his parents-in-law for the next few years. In 1943 he fled once again to Sweden where he stayed for three years. Here he gave lectures at the Universities of Stockholm, Uppsala and Lund. When the war ended in 1945, Geiger immediately returned to Århus, taking up his position as professor of sociology once more. His first step was to found the university institute for research into societies, the first institute of its kind in Scandinavia. From 1948 to 1952, Geiger published the series Nordiske Studier i Sociologie (Nordic Studies on Sociology) with Torgny Torgnysson Segerstedt, Veli Verkko and Johan Vogt. In 1949 he was a co-founder of the International Sociological Association. On 16 June 1952, Geiger died on the return trip from Canada to Denmark on board the ship "Waterman". Work Geiger is considered the founder of the concept of social stratification, using the concept of stratification (introduced by Edward Ross) for the analysis of social structures. According to this view, society is divided into an indefinite number of social levels or groups, defined according to attributes such as profession, education, upbringing, living standard, power, dress, religion, race, political opinion and organisation. This idea is closely connected to that of social mobility and the criteria for an industrial society. At least in Germany, he is also seen as an important contributor to the sociology of law, by publishing, in 1947, his "Vorstudien zu einer Soziologie des Rechts" (preliminary studies for a sociology of law). Geiger also worked on the fundamental concepts of sociology, working class education, industrial organisation, class structure, mobility, the origin and functions of the intelligentsia, critics of ideology, and the nature of modern mass-society and democracy. He also spent time studying the nature of revolutionary crowds. Geiger analysed the institutionalisation of the class struggle, which he called democratisation, and he considered it interconnected with corporativism. Geiger published more than 160 works, but only a few have been translated to English thus far. The