# Daniel Hershey

In human thermodynamics, Daniel Hershey (c.1931-) is an American chemical engineer noted for his 1980 to 2009 effort to ferret out an entropy theory of aging.

Overview
In 1980, Hershey, in his The New Age-Scale for Humans, argued that the derivative of the Prigogine entropy with respect to time:

$\frac{dS}{dt} = \frac{dS_e}{dt} + \frac{ds_i}{dt} \,$

applies to human systems. [4] He also mentions the entropy of fish work on aging of American engineer Robert Balmer.

In 1988, Hershey began to publish a number of articles on the application of entropy to aging theory and corporation growth and dynamics. [3]

In 2009, Hershey, in his Entropy Theory of Aging Systems, argued that entropy is a measure of disorder, and that systems left to their own tend to age towards disorder. The theory of the book culls from the nonequilibrium thermodynamics theories of Belgian chemist Ilya Prigogine and also from the information theory of American electrical engineer Claude Shannon. [1]

Education
Hershey completed his BS in 1953 at The Cooper Union and PhD in 1961 at the University of Tennessee, both in chemical engineering. Hershey currently is a professor emeritus of chemical engineering at the University of Cincinnati. [2]

References
1. Hershey, Daniel. (2009). Entropy Theory of Aging Systems: Humans, Corporations and the Universe. World Scientific.
2. Faculty – College of Engineering, Department of Chemical and Materials Engineering, University of Cincinnati.
3. (a) Hershey, Daniel. (1988). "Excess Entropy (EE) and Excess Entropy Production (EEP) in Aging, Evolving Systems," Systems Research, 5, pp. 261-263.
(b) Hershey, Daniel. (1988). "Aging and Evolving Systems," Systems Research, 5, p. 167.
(c) Hershey, Daniel. (1989). "Entropy Analysis of an Aging, Evolving Corporate System," Systems Research, 6, pp. 75-79.
(d) Hershey, Daniel. (1990). "Speculation on Organizational Structure, Entropy, and Function," Systems Research, 7, pp. 207-208.
(e) Hershey, Daniel. (1990). "Longevity Projections for Females Using Excess Entropy Production," Systems Research, 7, pp. 127-128.
(f) Hershey, Daniel. (1990). "The World as an Evolving System," in "Toward a Just Society," Proceedings of the Thirty-Fourth Annual Meeting, International Society for the Systems Sciences, Portland, Vol. I, pp. 456-461.
(g) Hershey, Daniel. (1990). "Evolving Systems, Entropy and Death," a chapter in "Time, Rhythms, and Chaos," Iowa State University Press, 1990, pp. 117-129.
(e) Hershey, Daniel. (1992)."A Rational Design of a Governing Structure for Czechoslovakia, in General Systems Alternative Economics and Values," Proceedings of the 36th Annual Meeting, International Society for the Systems Sciences, Denver, Vol. I, 134-140.
(f) Hershey, Daniel. (1993). "Entropy as a Biological Marker in Human Aging, a Chapter in Practical Handbook of Human Biologic Age Determination," CRC Press, A. Balin, editor.
4. Hershey, Daniel and Wang, Hsuan-Hsien. (1980). The New Age-Scale for Humans (thermodynamics, pgs. 24, 59, 62). Lexington Books.

Further reading
● Hershey, Daniel. (1997). The Universe and Beyond, Entropy, Infinity, and God. Basil Books.

External links
Daniel Hershey (research interests) – chemical and materials engineering, University of Cincinnati.
Hershey, Daniel – WorldCat Identities.