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- David Easton (1917) is a Canadian political scientist, who developed application of systems theory to political science.
- Frederick Edmund Emery (1925–1997) was an Australian psychologist, and pioneers in the field of Organizational development.
- Hugo O. Engelmann (1917–2002) was an American sociologist, anthropologist and general systems theorist.
- Joshua M. Epstein is an American expert in social and economic dynamics, and member of the Santa Fe Institute.
- Hugh Everett (1930–1982) was an American physicist, who developed the use of generalized lagrange multipliers in operations research.
Read more about this topic: List Of Systems Scientists