Felix Tretter (born in 1949 in Villach, Austria) is an Austrian psychologist and psychiatrist. From 1992 to 2014 he was head of the addiction department of the Isar-Amper-Klinikum München-Ost, formerly known as Bezirkskrankenhaus Haar, Bavaria, Germany. His scientific work has emphasis on modelling of psychophysical scenarios in schizophrenia and addiction research with methods of systems science.
Felix Tretter graduated in philosophy, psychology, medicine, statistics, sociology, and economics at the universities of Vienna and Munich. Subsequently, he worked as a scholar at the Max-Planck Institute for Psychiatry in Munich. After earning doctorates as Dr. phil., Dr. med. and Dr. rer. pol. he habilitated to qualify as a professor in clinical psychology at LMU Munich. Additionally, he was for several years involved in the constitution of environmental medicine in Germany.
Board-certified for neurology, psychiatry, and psychotherapy he was appointed the head of the addiction department of the Bezirkskrankenhaus Haar, a tertiary psychiatric hospital in the east of Munich. He held this position up to his retirement in 2014.
Felix Tretter is deputy head of the Bavarian Academy for Addiction and Health Issues (Bayerische Akademie für Sucht- und Gesundheitsfragen). Since 2015 he is fellow at the Bertalanffy Center for the Study of Systems Science (BCSSS) in Vienna.
Tretter wrote research papers, review articles, and books. The main focus of his scientific work is mathematical description of neuropsychological mechanisms in the evolution of schizophrenia and addiction. He aims at describing psychosocial problems from a perspective of cybernetics, systems and ecology. Additional publications by Tretter include systems biology and theory of medicine applied to different fields, including COVID-19.