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Luis von Ahn (Spanish: [ˈlwis fon ˈan]; born 19 August 1978) is a Guatemalan-American entrepreneur, software developer, and consulting professor in the Computer Science Department at Carnegie Mellon University in Pittsburgh, Pennsylvania.
This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.
reCAPTCHA Inc. [1] is a CAPTCHA system owned by Google.It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images.
An angel investor in Mixpanel, its founder Suhail Doshi credits Levchin for Mixpanel's survival and subsequent success. [25] Levchin is an investor in Evernote. He served on the company's board of directors from August 7, 2006, to 2016. [26] In December 2012, Levchin joined Yahoo's board of directors, [27] and remained until December 2015. [28]
Sanctum was founded in 1997 as Perfecto Technologies, by Eran Reshef and Gili Raanan.. The company released its first product AppShield in summer of 1999. [3]The company has done an extensive research in application security and applying formal methods to real life software [4] in collaboration with Turing Award winner Professor Amir Penueli.
Luis von Ahn – CAPTCHA inventor, Duolingo founder; William Bullock – printing press innovator; Charlie Cheever – co-founder of Quora; Brendan Eich – Mozilla, creator of JavaScript; Caterina Fake – co-founder of Flickr and Hunch; John P. Harris – theater owner; Regis McKenna – high technology marketing guru; Willard Rockwell ...
He is well known for work on the Isomap embedding algorithm, CAPTCHA challenges, Cover Trees for nearest neighbor search, Contextual Bandits (which he coined [2]) for reinforcement learning applications, [3] and learning reductions. [4] John is the author of the blog hunch.net and the principal developer of Vowpal Wabbit.
Altman was born on April 22, 1985, in Chicago, Illinois, [8] [9] into a Jewish family, [10] and grew up in St. Louis, Missouri.His mother is a dermatologist, while his father was a real estate broker.