This paper overviews Bowen family systems theory and its approach to family therapy. It aims to introduce this influential approach and a sample of developments in theory and practice since Bowen's first publications of his research and theory. This paper is the second edition of a 1999 article with the same title (Brown, Australian and New Zealand Journal of Family Therapy, 20, 94 and 1999) and, 25 years later, offers new insights from the original author's ongoing research into the theory. This new edition is in collaboration with a second author and Bowen theory scholar, bringing fresh perspectives on the theory's applicability to family therapy practice. The core concepts are presented briefly, and a case example with a parent and symptomatic adolescent demonstrates how theory informs the role of the therapist and the therapeutic work. Examples of criticisms of Bowen theory are also discussed, including the misinterpretation around the idea of emotion in Bowen theory that is communicated in Gottman's training. Differentiation of self is clarified as the integration of emotion and intellect rather than privileging one over another, which affords the opportunity for individuals to avoid being governed by the invisible strings of sensitivities in relationships and instead be themselves in good emotional contact with the other person.