Life is change, it involves a constant flow from one temporary state to another. Each of these changes is a transition or "a passage from one state, stage, subject, or place to another" (Transition, 2018). On the surface, an intern in management consulting, an assistant professor approaching tenure review, and a retiring auto worker would not appear to have much in common but each is transitioning in their own way from one stage of their job to another. Yet not all transitions are equally meaningful. For example, when two employees have a routine conversation, there is typically a transition into and out of the dialogue. The employees greet one another, discuss a topic, and then say goodbye. Or when employees engage in a routine commute, they depart their home, travel, and then enter their office building. These micro-transitions (Ashforth et al. 2000) are relatively minor, everyday work transitions that do not result in significant enduring shifts for the employee or organization. In this paper, we focus on relatively meaningful transitions. Meaningful transitions are those transitions that prompt significant subjective change in the lives of individuals. In the case of new employees adjusting to an organization, promoted employees accepting new responsibilities, and retiring employees shifting their focus and identity, these changes are marked by formal signs, typically involving paperwork, job title changes, and financial implications that underscore the significance of these transitions. Teams and organizations also undergo transitions, such as those prompted by shifting structure, policies, or leadership (Ashford 1988). In this paper, we examine theories that contribute to the understanding of transition, identify how transitions may affect health and performance, and propose an occupational health model of transition. We begin by focusing on assumptions underlying