Dr. Bill Walsh is the author of Nutrient Power and founder of the Walsh Research Institute. He has studied brain science and mental health issues like depression, anxiety, and criminality for 35 years. His research found that many criminals and troubled children had biochemical imbalances very early in life. Testing allows identification of deficiencies or overloads in key nutrients like zinc, copper, B6, and others linked to neurotransmitters. Correcting individual biochemical profiles through dietary and nutrient changes can successfully treat conditions like aggression, depression and anxiety.