Talcott Parsons
In sociology, systems thinking also began in the 20th century, including Talcott Parsons' action theory and Niklas Luhmann's social systems theory. According to Rudolf Stichweh (2011):Since its beginnings the social sciences were an important part of the establishment of systems theory... [T]he two most influential suggestions were the comprehensive sociological versions of systems theory which were proposed by Talcott Parsons since the 1950s and by Niklas Luhmann since the 1970s.Elements of systems thinking can also be seen in the work of James Clerk Maxwell, particularly control theory.