In order to have a successful career, Bender had already joined the NSDAP at that time. To be able to call himself an associate professor at the newly founded Reichsuniversität Straßburg, he was habilitated in 1941 with the treatise on the subject ""Experimentelle Visionen. Ein Beitrag zum Problem der Sinnestäuschung, des Realitätsbewusstseins und der Schichten der Persönlichkeit"". With the intervention of the historian Ernst Anrich, he became from the Reichsministerium for Sciences, Education and public instruction the necessary lectureship. From 1942 to 1944, he taught psychology and clinical psychology, also managing the Paracelsus Institute, where Bender originally planned to make research on the subject of astrology. At the request of his patron Friedrich Spieser, he studied the subject of dowsing.