Marti Olsen Laney

Laney is a psychotherapist who put the introvert case into general circulation with The Introvert Advantage in 2002, arguing that introversion is a question of where a person's energy comes from rather than shyness or a dislike of company. She grounds it in a claim that introverts and extroverts run on different neurotransmitter pathways, dopamine against acetylcholine, which is a much firmer statement than the research will carry. The practical half, on surviving meetings, parties and open-plan offices, is what readers keep it for.