# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/herbert-callen
# Generated: 2026-08-13T03:17:12.919Z

schema: https://schema.org/Person
url: "https://fame.am/person/herbert-callen"
name: "Herbert Callen"
slug: "herbert-callen"
description: "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. He is also known for developing the fluctuation–dissipation theorem. During World War II, his services were invoked in the theoretical division of the Manhattan Project."
tagline: "American physicist (1919–1993)"
gender: "male"
country:
  name: "United States"
  isoCode: "US"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1919-07-01"
deathDate: "1993-03-22"
livingStatus: "DECEASED"
scores:
  popularity:           41.86
  momentum:             0.1954397394136808
  historical:           8.944601333333333
  currentAttention:     0
  sourceConfidence:     54.99999999999999
  profileCompleteness:  55
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://en.wikiquote.org/wiki/Herbert_Callen"
    title: "Wikiquote"
    type:  "WEBSITE"
  - url: "https://ar.wikipedia.org/wiki/%D9%87%D8%B1%D8%A8%D8%B1%D8%AA_%D9%83%D8%A7%D9%84%D9%8A%D9%86"
    title: "هربرت كالين"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D9%87%D8%B1%D8%A8%D8%B1%D8%AA_%D9%83%D8%A7%D9%84%D9%8A%D9%86"
    title: "هربرت كالين"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Herbert_B._Callen"
    title: "Herbert B. Callen"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Herbert_Callen"
    title: "Herbert Callen"
    type:  "WIKIPEDIA"
  - url: "https://es.wikipedia.org/wiki/Herbert_B._Callen"
    title: "Herbert B. Callen"
    type:  "WIKIPEDIA"
  - url: "https://fa.wikipedia.org/wiki/%D9%87%D8%B1%D8%A8%D8%B1%D8%AA_%DA%A9%D8%A7%D9%84%D9%86"
    title: "هربرت کالن"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Herbert_Callen"
    title: "Herbert Callen"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Herbert_Callen"
    title: "Herbert Callen"
    type:  "WIKIPEDIA"
  - url: "https://pt.wikipedia.org/wiki/Herbert_Callen"
    title: "Herbert Callen"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q1608008"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump