sixth and last volume Et lite land i verden together with Trond Berg Eriksen. In 2004 he was the co-editor of Et rettferdig oppgjør? with Hans Fredrik Dahl, a work on the legal purge in Norway after World War II. Historien om det som ikke skjedde, published in the same year, revolves around various counterfactual history events. Two years later, he published Den store sammensvergelsen. Historien om det hemmelige selskapet Illuminatus og dets mange ugjerninger, about the many theories concerning the secret society Illuminati. In 2010, he published a book on totalitarian ideologies, entitled Drømmen om det fullkomne samfunn. Sørensen is also considered an international expert on the Donald Duck universe, and was behind the publishing of the complete, thirty-volume works of Carl Barks in Norwegian, Swedish and Danish in 2004. Sørensen's expertise also includes the world of The Phantom, and he was actively involved with the publishing of twenty volumes chronicling the different generations of Phantoms, each separate volume featuring a scholarly article, written by Sørensen, summarising the relevant historical themes. References External links Profile at the University of Oslo List of publications in FRIDA 1954 births Living people People from Skedsmo 20th-century Norwegian historians Historians of World War II Academic staff of the University of Oslo Members of the Norwegian Academy of Science and Letters 21st-century Norwegian historians