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Systems theory is manifest in the work of practitioners in many disciplines, for example the works of biologist Ludwig von Bertalanffy, linguist Béla H. Bánáthy, and sociologist Talcott Parsons; in the study of ecological systems by Howard T. Odum, Eugene Odum; in Fritjof Capra's study of organizational theory; in the study of management by Peter Senge; in interdisciplinary areas such as Human Resource Development in the works of Richard A. Swanson; and in the works of educators Debora Hammond and Alfonso Montuori.