Kenneth E. Boulding (1910–1993) British-American economist
Source: 1970s, Ecodynamics: A New Theory Of Societal Evolution, 1978, p. 20
Michael Halliday (2005, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011) "A Management Perspective on Social Ecological Systems". In: Human Ecology Review, Vol. 18, No. 1, 2011.
1970s and later
Kenneth E. Boulding (1910–1993) British-American economist
Source: 1970s, Ecodynamics: A New Theory Of Societal Evolution, 1978, p. 20
Chester Barnard book The Functions of the Executive
Source: The Functions of the Executive (1938), p. 98-99, footnote
Jay Lemke (1946) American academic
Source: Textual politics: Discourse and social dynamics, 1995, p. 159
Michael Halliday (1925–2018) Australian linguist
Michael Halliday (2006, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011).
1970s and later
Francis Heylighen (1960) Belgian cyberneticist
Francis Heylighen, 1990, "Classical and non-classical representations in physics I." Cybernetics and Systems 21. p. 423; As cited by: Hieronymi, A. (2013), Understanding Systems Science: A Visual and Integrative Approach. Syst. Res.. doi: 10.1002/sres.2215
Ludwig von Bertalanffy (1901–1972) austrian biologist and philosopher
Von Bertalanffy (1950) " The Theory of Open Systems in Physics and Biology http://vhpark.hyperbody.nl/images/a/aa/Bertalanffy-The_Theory_of_Open_Systems_in_Physics_and_Biology.pdf" In: Science, January 13, 1950, Vol. 111. p. 23 <br class="br">1950s
“The observing mind is not a physical system, it cannot interact with any physical system.”
Erwin Schrödinger (1887–1961) Austrian physicist
Nature and the Greeks (1954)
Context: The observing mind is not a physical system, it cannot interact with any physical system. And it might be better to reserve the term "subject" for the observing mind. … For the subject, if anything, is the thing that senses and thinks. Sensations and thoughts do not belong to the "world of energy."
Ludwig von Bertalanffy (1901–1972) austrian biologist and philosopher
As cited in: Debora Hammond (2005). "Philosophical and Ethical Foundations of Systems Thinking", in: tripleC 3(2): pp. 20–27.
1950s, Problems of Life (1952, 1960)
A. Wayne Wymore (1927–2011) American mathematician
Systems Movement: Autobiographical Retrospectives (2004)
Donald H. Liles (1947) American engineer
Source: Enterprise modeling within an enterprise engineering framework (1996), p. 993