The Main Idea: The neurobiological theory of mental illness is not credited to a single person but rather is the result of decades of research by multiple scientists and researchers in the fields of neuroscience, genetics, and psychiatry. The theory suggests that mental illnesses are caused by a combination of genetic, environmental, and neurological factors rather than being solely the result of personal weakness or moral failing. This understanding can help reduce the stigma around mental illness and inform more effective approaches to treatment and support for those struggling with mental health issues.