A neuroscientist is a trained scientist (typically with a PhD or a MD) who studies the scientific field of neuroscience or any of its related sub-fields. Neuroscience is a highly interdisciplinary field encompassing study in fields such as biology, chemistry, biochemistry, pharmacology, medicine, psychiatry, psychology, engineering, and mathematics. Any individual from these fields who contributes to neuroscience-related research can be considered a neuroscientist.