Max Liebermann, CC0, via Wikimedia Commons

scientistpolitician

Felix Klein

Politician · born April 25, 1849 · died 1925

About

Felix Christian Klein was a German mathematician, mathematics educator and historian of mathematics, known for his work in group theory, complex analysis, non-Euclidean geometry, and the associations between geometry and group theory.

Adapted from Wikipedia (CC BY-SA 4.0).

Milestones, by age

Dated facts from Wikidata; ages marked “about” come from year-only dates.

~27Became editor1876
~44Received the De Morgan Medal1893
~63Received the Copley Medal1912

Sources

Every fact on this page traces to one of these.

Sources (2)

Felix Klein (Q76641) · Wikidata
Felix Klein · Wikipedia

Also born on April 25

Felix's most notable birthday twins

billionaire

Jim Simons

Entrepreneur

1938–2024 · United States

$23.5Bolder estimate, as of November 2020 · Forbes

James Harris Simons was an American hedge fund manager, investor, mathematician, and philanthropist. At the time of his death, Simons's net worth was estimated to be $31.4 billion, making him the 55th-richest person in the world.

Gleuschk, CC BY-SA 3.0, via Wikimedia Commons

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Sources (5)

Jim Simons (Q560847) · Wikidata
Jim Simons · Wikipedia
Jim Simons — Forbes net worth (via Wikidata) · Forbes · 2020
Jim Simons — Forbes net worth (via Wikidata) · Forbes · 2019
Jim Simons — Forbes net worth (via Wikidata) · Forbes · 2018

billionaire

Adam Neumann

Entrepreneur · WeWork · finance

1979 · Israel

$2.3Bolder estimate, as of October 2021 · Bloomberg

Adam Neumann is an Israeli and American billionaire businessman. In 2010, he co-founded WeWork with Miguel McKelvey, where he was CEO from 2010 to 2019.

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Sources (3)

Adam Neumann (Q34579349) · Wikidata
Adam Neumann · Wikipedia
Adam Neumann — Bloomberg net worth (via Wikidata) · Bloomberg · 2021

actor

Al Pacino

Actor

1940 · United States

Alfredo James Pacino is an American actor. Known for his intense performances on stage and screen, Pacino is widely regarded as one of the greatest actors of all time.

Embajada de EEUU en la Argentina, CC BY 2.0, via Wikimedia Commons

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Sources (2)

Al Pacino (Q41163) · Wikidata
Al Pacino · Wikipedia

author

Marcus Aurelius

Politician

0121–0180 · Ancient Rome

Marcus Aurelius Antoninus was Roman emperor from 161 to 180 and a Stoic philosopher.

Sources (2)

Marcus Aurelius (Q1430) · Wikidata
Marcus Aurelius · Wikipedia

actor

Renée Zellweger

Actor

1969 · United States

Renée Kathleen Zellweger is an American actress. She is the recipient of various accolades, including two Academy Awards, two British Academy Film Awards, and four Golden Globe Awards.

Siebbi, CC BY 3.0, via Wikimedia Commons

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Sources (2)

Renée Zellweger (Q122614) · Wikidata
Renée Zellweger · Wikipedia

athlete

Johan Cruyff

Athlete

1947–2016 · Kingdom of the Netherlands

Hendrik Johannes Cruijff, internationally known as Johan Cruyff was a Dutch professional football player and manager. Regarded as one of the greatest players in history and as the greatest Dutch footballer ever, he won the Ballon d'Or three times, in 1971, 1973, and 1974.

Sources (2)

Johan Cruyff (Q17163) · Wikidata
Johan Cruyff · Wikipedia