Herbert Callen
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Biography
Herbert Bernard Callen was an American physicist specializing in thermodynamics and statistical mechanics. He is considered one of the founders of the modern theory of irreversible thermodynamics, and is the author of the classic textbook Thermodynamics and an Introduction to Thermostatistics, published in two editions.
"Only inspired insight guided by faith in the simplicity of nature somehow revealed the interplay of the concepts of energy and entropy."