Donald Robertson 
The Philosophy of Cognitive-Behavioural Therapy (CBT) : Stoic Philosophy as Rational and Cognitive Psychotherapy [PDF ebook] 
Stoic Philosophy as Rational and Cognitive Psychotherapy

Why should modern psychotherapists be interested in philosophy, especially ancient philosophy? Why should philosophers be interested in psychotherapy? There is a sense of mutual attraction between what are today two thoroughly distinct disciplines. However, arguably it was not always the case that they were distinct.Donald Robertson takes the view that by reconsidering the generally received wisdom concerning the history of these closely-related subjects, we can learn a great deal about both philosophy and psychotherapy, under which heading he includes potentially solitary pursuits such as 'self-help’ and 'personal development’.