In response to clinical observations and research findings that individuals with generalized anxiety disorder are reactive to their internal experiences, avoid and suppress painful emotions, thoughts, and sensations, and limit their involvement in meaningful activities, an Acceptance Based Behavioral Therapy (ABBT) was developed to specifically target these responses. ABBT incorporates acceptance and mindfulness strategies with more traditional behavior therapy techniques. Specifically, ABBT uses mindfulness and acceptance approaches as an alternate response to the rigid, avoidant responses characteristic of GAD. Likewise, therapy focuses on identifying and enacting behaviors that are congruent with what is personally meaningful to the client rather than engaging in actions that are motivated by avoidance of anxiety. This article provides a case conceptualization from an ABBT perspective for “William,” the composite client presented in Robichaud (this issue). The article goes on to demonstrate how an ABBT approach to treatment may unfold session-by-session for “William.”