Tijmen Bostoen, MD is a psychiatrist and a master of Pharmaceutical Sciences. He is Co-Investigator of the current European phase 2 multi-center MDMA assisted Psychotherapy for PTSD trial and is a study therapist for this trial. He has specialized in the pharmacotherapy and psychotherapy of PTSD and works at ARQ Centrum ’45, the National Dutch center for complex psychotrauma. His PhD research at Leiden University Medical Center/ARQ Centrum ‘45 focuses on the clinical application of psychedelics in the treatment of PTSD and he is currently developing a protocol for ketamine assisted psychotherapy for therapy resistant PTSD.