Born On Your Day
Ernst Alexanderson
None listed, Public domain, via Wikimedia Commons

inventor

Ernst Alexanderson

Inventor · born January 25, 1878 · died 1975

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About

Ernst Frederick Werner Alexanderson was a Swedish-American electrical engineer and inventor who was a pioneer in radio development. He invented the Alexanderson alternator, an early radio transmitter used between 1906 and the 1930s for longwave long distance radio transmission.

Adapted from Wikipedia (CC BY-SA 4.0).

Milestones, by age

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

  1. ~41Received the IEEE Medal of Honor1919
  2. ~66Received the Edison Medal1944

Sources

Every fact on this page traces to one of these.

Sources (2)

Also born on January 25

Ernst's most notable birthday twins

Brian Armstrong
billionaire

Brian Armstrong

Entrepreneur · Coinbase

1983 · United States

$12.9Bolder estimate, as of 2025 · Forbes

Brian Armstrong is an American businessman and investor who is CEO of cryptocurrency platform Coinbase, which he co-founded with Fred Ehrsam. He received media attention for his policy of keeping the workplace free of political activism.

TechCrunch, CC BY 2.0, via Wikimedia Commons

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Sources (3)
Sheila Crump Johnson
entrepreneur

Sheila Crump Johnson

Entrepreneur

1949 · United States

$840Molder estimate, as of June 2023 · Forbes

Sheila Crump Johnson is an American businesswoman, who co-founded BET and is the CEO of Salamander Hotels and Resorts. In 2001, she became the first Black female billionaire after the purchase of BET by Viacom.

David Shankbone, CC BY 3.0, via Wikimedia Commons

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Virginia Woolf
author

Virginia Woolf

Author

1882–1941 · United Kingdom

Adeline Virginia Woolf was an English writer and one of the most influential 20th-century modernist authors. She helped to pioneer the use of stream of consciousness narration as a literary device.

Unknown authorUnknown author, Public domain, via Wikimedia Commons

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Paul Nurse
scientist

Paul Nurse

Scientist

1949 · United Kingdom

Nobel prize winning British biochemist

Not specified in the submission, CC BY-SA 3.0, via Wikimedia Commons

Sources (1)