James Gilligan, Professor of Clinical Psychiatry, NYU, wrote Violence (1996), Preventing Violence (2001), Why Some Politicians Are More Dangerous Than Others (2011), a Times Literary Supplement 'Book of the Year', and co-authored The Dangerous Case of Donald Trump (2016), a New York Times best-seller. His advice has been sought by President Clinton, Tony Blair, Kofi Annan, the World Health Organization, and the World Court.