He moved to Netherlands, and worked as a professor for press, propaganda and public opinion research at Amsterdam University (1946-1947). He founded the institute for the science of the press at Amsterdam University in July 1948 and was its first director.

Literary works

• Der Massenwahn, seine Wirkung und seine Beherrschung, 1923 ()
• De strijd met den duivel. De heksenprocessen in het licht der massapsychologie, 1948 ()
• De krant door alle tijden, 1938 ()
• Du und die Masse, ²1951 ()

See also

• Rita Kohnstamm (Rita Kohnstamm)