Born On Your Day
John L. Hall
NIST, Public domain, via Wikimedia Commons

scientistTop tier

John L. Hall

Scientist · born August 21, 1934

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About

John Lewis "Jan" Hall is an American physicist. He shared the 2005 Nobel Prize in Physics with Theodor W. Hänsch "for his contribution to the quantum theory of optical coherence."

Adapted from Wikipedia (CC BY-SA 4.0).

Milestones, by age

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

  1. ~71Received the Nobel Prize in Physics2005

Sources

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Sources (2)

Also born on August 21

John's most notable birthday twins

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Entrepreneur · Google · technology

1973 · United States

$49.8Bolder estimate, as of 2019 · Forbes

Sergey Mikhailovich Brin is an American computer scientist and businessman who co-founded Google with Larry Page. He was the president of Google's parent company, Alphabet Inc., until stepping down from the role in 2019.

Steve Jurvetson, CC BY 2.0, via Wikimedia Commons

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François Pinault
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François Pinault

Entrepreneur · Kering

1936 · France

$29.7Bolder estimate, as of 2019 · Forbes

François Henri Joseph Pinault is a French billionaire businessman, founder of the luxury group Kering and the investment holding company Groupe Artémis. In the early 1960s, Pinault started a timber-trading business.

S. Plaine, CC BY-SA 4.0, via Wikimedia Commons

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Joe Gebbia
billionaire

Joe Gebbia

Founder · Airbnb · hospitality

1981 · United States

$8Bolder estimate, as of 2025 · Forbes

Joseph Gebbia Jr. is an American designer and entrepreneur, and a co-founder of Airbnb. In 2025, he joined the Department of Government Efficiency (DOGE). Gebbia was appointed by President Donald Trump as the first Chief Design Officer to lead the National Design Studio.

Ryan Lowry, CC BY-SA 4.0, via Wikimedia Commons

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Sources (3)