Donald Robertson is a cognitive-behavioural psychotherapist who specializes in evidence-based approaches to the treatment of anxiety, and the relationship between ancient philosophy and modern psychotherapy, particularly Stoicism and cognitive-behavioural therapy (CBT). He is the author of six books on philosophy and psychotherapy, including Build your Resilience (Hodder & Stoughton, 2012) in the Teach Yourself series and The Philosophy of Cognitive-Behavioural Therapy: Stoic Philosophy as Rational and Cognitive Psychotherapy (Karnac, 2010). Donald was born in Scotland, and lived in England for many years where he ran a busy Harley Street therapy practice, before emigrating to Canada, where he currently lives.