Donald J. Robertson is a cognitive-behavioral psychotherapist, trainer, and writer specializing in the relationship between modern psychology and ancient philosophy. He is the author of several acclaimed books including "How to Think Like a Roman Emperor," "Stoicism and the Art of Happiness," and "The Philosophy of Cognitive Behavioural Therapy." Robertson has trained cognitive-behavioral therapists internationally and taught courses on philosophy and psychotherapy at universities in the UK. Drawing on his expertise in both Stoicism and evidence-based therapy, he bridges classical wisdom with contemporary psychological practice, making ancient philosophy accessible and relevant to modern readers seeking practical guidance for living well.