Simon Green was for many years a Senior Lecturer in Psychology at Birkbeck, University of London. Recently retired, he specialised in teaching introductory neuroscience to first year students. Along the way he published several textbooks in the area, including ‘Principles of Biopsychology’, still in print after 25 years. His research interests include neurotransmitter and hormonal modulation of brain function, the evolutionary background to the modern human brain, and the psychological and biological roots of psychological disorders. He is a Chartered Psychologist and member of the British Psychological Society.