Montessori educators believe that there are a number of important factors that are necessary for a child to successfully attain adulthood. They include family, a stable home, good adult mentors, and a strong system of education that includes fostering of independence, autonomy of the individual, and joyful learning opportunities with a system environment. Geoffrey Bishop mentions one additional element that he believes to be of equal importance in a child's life, and that is unstructured and unrestricted outdoor and nature play. Bishop points toward Richard Louv's book "Last Child in the Woods" (2008), and how it speaks of the "Nature Deficit Disorder" he sees in many of today's children. Bishop writes here that he sees this nature deficit as well in his own role as the head of a Montessori school set on 400 acres. As the head of an Outdoor Environmental Education program, he draws on lessons learned from his own childhood, and describes how he aims to correct this deficit for the children in his program.