Maksymilian Rafailovych "Max" Levchin (Ukrainian: Максиміліан Рафаїлович Левчин; born July 11, 1975) is a Ukrainian-American software engineer and businessman. In 1998, he co-founded the company that eventually became PayPal. Levchin made contributions to PayPal's anti-fraud efforts and was the co-creator of the Gausebeck-Levchin test, one of the first commercial implementations of a CAPTCHA challenge response human test. He founded or co-founded the companies Slide.com, HVF, and Affirm. He was an early investor in Yelp and was their largest shareholder in 2012. He left a leadership role in Yelp in 2015. More information...
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