Marcin Siwek is a Professor and Head of the Department of Affective Disorders at Jagiellonian University. He serves as Deputy Head of the Clinical Department of Psychiatry of the Krakow University Hospital. He also holds membership in other professional societies, including Member of the Polish Psychiatric Association and the Polish Society for the Study of Pain, Co-creator and Deputy Editor-in-Chief of Practical Medicine–Psychiatry, Member of the Editorial Board of Brain Sciences, etc. His main professional interests are the treatment of depression, bipolar disorder and anxiety disorders, co-existing pain and mental disorders, pharmacotherapy of treatment-resistant conditions, interactions and side effects of drugs, neuropsychiatry, biological basis of mental illness, early diagnosis and prevention of mood disorders and issues of medical cooperation.