Urie Bronfenbrenne, a developmental psychologist who is most known for his ecological systems theory of child development. Bronfenbrenner's research and his theory was key in changing the perspective of developmental psychology by calling attention to thelarge number of environmental and societal influences on child development. His theory states that there are many different levels of environmental influences that can affect a child's development, starting from people and institutions immediately surrounding theindividual to nationwide cultural forces.