# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/leonard-jaczewski
# Generated: 2026-08-12T22:24:38.090Z

schema: https://schema.org/Person
url: "https://fame.am/person/leonard-jaczewski"
name: "Leonard Jaczewski"
slug: "leonard-jaczewski"
description: "Leonard Jaczewski was a Polish geologist, geographer, engineer and explorer of Siberia. He was one of the pioneers in the study of permafrost."
tagline: "Polish-Russian explorer, geographer, geologist, cartographer, and mining engineer (1858–1916)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Leonard_Yachevsky.jpg?width=1200"
gender: "male"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1858-08-30"
deathDate: "1916-04-20"
livingStatus: "DECEASED"
scores:
  popularity:           37.8
  momentum:             3.75
  historical:           5.003528
  currentAttention:     0
  sourceConfidence:     30
  profileCompleteness:  60
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://en.wikipedia.org/wiki/Leonard_Jaczewski"
    title: "Leonard Jaczewski"
    type:  "WIKIPEDIA"
  - url: "https://pl.wikipedia.org/wiki/Leonard_Jaczewski"
    title: "Leonard Jaczewski"
    type:  "WIKIPEDIA"
  - url: "https://ru.wikipedia.org/wiki/%D0%AF%D1%87%D0%B5%D0%B2%D1%81%D0%BA%D0%B8%D0%B9%2C_%D0%9B%D0%B5%D0%BE%D0%BD%D0%B0%D1%80%D0%B4_%D0%90%D0%BD%D1%82%D0%BE%D0%BD%D0%BE%D0%B2%D0%B8%D1%87"
    title: "Ячевский, Леонард Антонович"
    type:  "WIKIPEDIA"
  - url: "https://tr.wikipedia.org/wiki/Leonard_Jaczewski"
    title: "Leonard Jaczewski"
    type:  "WIKIPEDIA"
  - url: "https://uk.wikipedia.org/wiki/%D0%AF%D1%87%D0%B5%D0%B2%D1%81%D1%8C%D0%BA%D0%B8%D0%B9_%D0%9B%D0%B5%D0%BE%D0%BD%D0%B0%D1%80%D0%B4_%D0%90%D0%BD%D1%82%D0%BE%D0%BD%D0%BE%D0%B2%D0%B8%D1%87"
    title: "Ячевський Леонард Антонович"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q4539854"
    title: "Wikidata"
    type:  "WIKIDATA"

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