The Department of Psychology (Norwegian: Psykologisk institutt) at the University of Oslo is the oldest and largest research institute and educational institution in psychology in Norway. It was established in 1909 by Anathon Aall, who had recently been appointed by the King-in-Council as Professor of Philosophy. The first Professor of Psychology at the University of Oslo was Harald Schjelderup, who was appointed by the King-in-Council in 1928. The Department of Psychology was originally part of the Faculty of Humanities, and became part of the Faculty of Social Sciences in 1963. It has around 90 academic employees and around 1100 students. The Department of Psychology at Oslo has had an important role in the development of psychology as a discipline since the early 20th century.