Bela H. Banathy (1919–2003) Hungarian systems scientist, design scientist, educator, author and coordinator of many international systems research conferences.
Mario A. Bunge (1919–2020) Argentine-Canadian physicist and philosopher, author of the 8-volume Treatise on Basic Philosophy (1974–1989), comprising semantics, ontology, epistemology, philosophy of science and ethics. His systemism includes the CESM (composition-environment-structure-mechanism) model for describing and explaining concrete systems.
Gerhard Chroust (born 1941) Austrian systems scientist, and Professor Emeritus for Systems Engineering and Automation at the Institute of System Sciences at the Johannes Kepler University of Linz, Austria.
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Vladimir Damgov (1947–2006) Bulgarian physicist, mathematician, union leader and parliamentarian, who particularly contributed to the application of chaos theory.
Heinz von Foerster (1911–2002) Austrian-American scientist combining physics and philosophy. Together with Warren McCulloch, Norbert Wiener, and John von Neumann, Heinz von Foerster was the architect of cybernetics.
Jay Forrester (1918–2016) American computer engineer, known as founder of System Dynamics, which deals with the simulation of interactions between objects in dynamic systems.
Buckminster Fuller (1895–1983) American visionary, designer, architect, poet, author, and inventor. He was one of the first to propagate a systemic worldview and explored principles of energy efficiency and material efficiency in the fields of architecture, engineering and design.
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Murray Gell-Mann (1929–2019) American physicist and Nobel Prize winner in physics for his work on the theory of elementary particles.
Ralph Waldo Gerard (1900–1974) American neurophysiologist and behavioral scientist and one of the founders of the Society for General Systems Research.
Jamshid Gharajedaghi (born c. 1940) American organizational theorist, management consultant, and Adjunct Professor of Systems thinking
Harry H. Goode (1909–1960) American computer engineer and systems engineer and professor at University of Michigan. Until his death his was president of the National Joint Computer Committee (NJCC). He wrote the famous System Engineering Handbook together with Robert Engel Machol.
Brian Goodwin (1931–2009) Canadian mathematician and biologist
Arthur David Hall III (1925–2006) American electrical engineer. He worked for years at Bell Labs. He was one of the founders of the (IEEE) and was among the first general systems theorists. He wrote A methodology of Systems Engineering from 1962.
Stephen G. Haines (1945–2012) American organizational theorist and management consultant
Debora Hammond American historian of science and a systems scientist
Albert Hanken (1926–2016) Dutch mathematician and Emeritus Professor Systems theory at the University of Twente
Friedrich Hayek (1899–1992) Nobel prize economist and a philosopher who made pioneering contributions to complexity theory. He notably wrote The Theory of Complex Phenomena (1967).
Francis Heylighen (born 1960) Belgian cybernetician working on self-organization and the evolution of complex systems
George Klir (1932–2016) Czech-American computer scientist and professor of systems sciences at the Center for Intelligent Systems at the Binghamton University in New York. Author of several texts on systems, including Architecture of Systems Problem Solving.
Klaus Krippendorff (born 1932) German cyberneticist, working on the mathematical foundations of cybernetics, general systems, communication and information theories.
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Christopher Langton (born 1949) American biologist and one of the founders of the field of artificial life
Ervin László (born 1932) Hungarian philosopher of science, systems theorist, integral theorist, and classical pianist
Ton de Leeuw (born 1941) Dutch organizational theorist
Luis M. Rocha (born 1966) Portuguese-American systems thinker
Robert Rosen (1934–1998) American biologist and systems thinker
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Andrew P. Sage (1933–2014) American systems engineer and Emeritus Professor and Founding Dean Emeritus at the School of Information Technology and Engineering of the George Mason University
Sytse Strijbos (born 1944) Dutch academic, lecturer of philosophy of technology at the Vrije Universiteit in Amsterdam
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Len Troncale (born 1943) American biologist, systems theorist, Professor Emeritus of Cellular and Molecular Biology, and former Director of the Institute for Advanced Systems Studies at the California State Polytechnic University
Jaan Tallinn (born 1972) co-developer of the original Skype distributed system, co-founder of the Future of Life Institute and Centre for the Study of Existential Risk, accredited/trained physicist
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Stuart A. Umpleby (born 1944) American cyberneticist working in the field of cross-cultural management, cybernetics, group facilitation methods, systems science and the use of computer networks.
Ludwig von Bertalanffy (1901–1972) Austrian Canadian biologist, physiologist and systems scientist, and cofounder of the International Society for Systems Science
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John Nelson Warfield (1925–2009) American electrical engineering and systems scientist, and member of the Academic Committee of the International Encyclopedia of Systems and Cybernetics.
Kevin Warwick (born 1954) British cybernetician with interests in artificial intelligence, robotics, control systems and biomedical engineering, especially implant technology.
Stephen Wolfram (born 1959) English theorist known for his work in theoretical particle physics, cellular automata, complexity theory, and computer algebra.
A. Wayne Wymore (1927–2011) American mathematician and systems engineer. Founder and first Chairman of Systems and Industrial Engineering (SIE) Department at the University of Arizona.
Warren Weaver (1894–1978) American mathematician and communication scientist
Norbert Wiener (1894–1964) American mathematician and one of the founders of cybernetics
Erik Christopher Zeeman (1925–2016) Japanese-born British mathematician known for work in geometric topology and singularity theory.
Gerard de Zeeuw (born 1936) Dutch scientist and professor Mathematical modelling of complex social systems at the University of Amsterdam in the Netherlands.