In order to promote developmental outcomes with children and young people and to nurture their positive health and well-being in foster care, social workers and case managers are required to direct professional attention toward both the child or young person and her/his daily living environment(s)--at home, at school, and in the local neighborhoods in which they live. When viewed from an ecological perspective, foster care environments are represented conceptually as a nested cluster of settings ranging from immediate life spaces and networks of relationships in a foster home, at school, and in a neighborhood, to organizational contexts holding a statutory duty of care for children and young people assigned looked after status, along with national policies and statutes which frame foster-care environments. This article explores how social-work roles and tasks with children and young people in foster care change as Social Workers transition from case management roles within state, provincial, or local authority departments to become Supervising Social Workers, or Team Managers of Foster Carers, or Directors of foster care services. (Contains 17 notes and 5 figures.)