Donald is the author of a recent graphic novel called Verissimus: The Stoic Philosophy of Marcus Aurelius (St Martins), with artwork by award-winning Portuguese illustrator, Ze Nuno Fraga, which was an Amazon editors’ choice for Best History book. He has written seven books altogether combining ancient philosophy and modern psychology, including Stoicism and the Art of Happiness and The Philosophy of Cognitive-Behavioural Therapy, now both in their second editions. He is also the author of How to Think Like a Roman Emperor (St. Martins), a philosophy bestseller, which was reviewed in the Wall Street Journal, and has since been translated into
