Dr. Passie worked as a scientist, psychiatrist and psychotherapist at Hannover Medical School from 1997 – 2010 and was head of the Laboratory for Consciousness and Neurocognition. He has conducted clinical studies with substances such as cannabis and MDMA, and has special expertise in the pharmacology of psychedelic substances and psycholytic therapy. He is currently a visiting scientist at the Goethe-University Frankfurt/ Main.