Although evidence-based treatments (EBTs) exist for both bulimia nervosa and binge eating disorder, there is far less evidence underpinning the treatment of anorexia nervosa (AN). Furthermore, there is no clearly defined standardized approach to patients who have not responded to treatment over an extended period of time. Chronic eating disorder patients in particular might need long-term engagement with treatment providers offering a wide range of interventions. This case study highlights how an experienced private practitioner systematically employed a variety of EBT techniques for a patient with a severe, long-term eating disorder and its comorbidities, within a model of attachment and collaboration. The practice of utilizing a wide variety of EBT techniques in a systematic manner guided by clinical expertise and supported by a therapy relationship of collaboration and attachment may prove to be a fruitful avenue for future research. © 2013 by Wiley Periodicals, Inc.