Willem Klein

Dutch mental calculator (1912–1986)
Person human Q2069856
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Willem Klein

Summary

Willem Klein is a human[1]. He was born in Amsterdam[2]. He was born on December 4, 1912[3]. He died in Amsterdam[4]. He died on August 1, 1986[5]. He worked as a mathematician[6] and mental calculator[7]. He has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[8]

Key Facts

  • Willem Klein was born in Amsterdam[2].
  • Willem Klein passed away in Amsterdam[4].
  • Willem Klein was born on December 4, 1912[3].
  • Willem Klein died on August 1, 1986[5].
  • Willem Klein held citizenship in Kingdom of the Netherlands[9].
  • Willem Klein worked as a mathematician[6].
  • Willem Klein's professions included mental calculator[7].
  • Willem Klein is recorded as male[10].
  • Willem Klein's instance of is recorded as human[11].
  • Willem Klein's family name is recorded as Klein[12].
  • Willem Klein's given name is recorded as Willem[13].
  • Willem Klein's manner of death is recorded as homicide[14].
  • Willem Klein's name in native language is recorded as {'lang': 'nl', 'text': 'Willem Klein'}[15].

Body

Origins and Family

Willem Klein was born in Amsterdam[2]. He was born on December 4, 1912[3].

Career and Affiliations

Recorded occupations include mathematician[6] and mental calculator[7].

Death and Burial

Willem Klein died on August 1, 1986[5]. He passed away in Amsterdam[4].

Why It Matters

Willem Klein has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[8] He is known by 5 alternative names across languages and contexts.[16]

FAQs

Where was Willem Klein born?

Willem Klein was born in Amsterdam[2].

Where did Willem Klein die?

Willem Klein passed away in Amsterdam[4].

What did Willem Klein do for work?

Willem Klein worked as mathematician[6] and mental calculator[7].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] . wikidata.org.
  2. [4] . wikidata.org.
  3. [10] . wikidata.org.
  4. [9] . wikidata.org.
  5. [11] . wikidata.org.
  6. [6] . wikidata.org.
  7. [7] . wikidata.org.
  8. [3] . Biografisch Portaal. wikidata.org.
  9. [5] . Biografisch Portaal. wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [8] . Wikidata sitelinks. wikidata.org.
  2. [16] . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Willem Klein. Retrieved April 10, 2026, from https://4ort.xyz/entity/willem-klein
MLA “Willem Klein.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/willem-klein.
BibTeX @misc{4ortxyz_willem-klein_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Willem Klein}}, year = {2026}, url = {https://4ort.xyz/entity/willem-klein}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Willem Klein — https://4ort.xyz/entity/willem-klein (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/willem-klein · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 5d ago · Printstream · 2026-07-05 view diff on Wikidata ↗
    Family name Klein
    Gnd id 1353887413
    Manner of death homicide
    Country of citizenship Kingdom of the Netherlands
    + 10 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/39939|batch #39939]]: add missing GNDs"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.