We are excited to invite you to participate in the 2023 Giessen International Schizophrenia Symposium (GISS) to be held in Giessen, Germany on 20-22 April 2023. This year highlights include the lectures from the Nobel laureate Tom Sudhof “Synapses in neuropsychiatric disorders: NRXN1 deletions and beyond”, from Iris Sommer (Professor of Psychiatry, Groningen, Netherlands): „Nutritional Psychiatry“, from Andreas Meyer-Lindenberg (CEO and Chair, Central Institute of Mental Health, Germany): Mechanisms of Risk- and resilience in schizophrenia and from the EPA president Peter Falkai about „Aerobic Exercise in Schizophrenia: Understanding and Cure“ (LMU Munich, Germany).