John Wallis

Mathematician and Cryptographer John Wallis Full Name: John Wallis
Nationality: English

Profession: Mathematician and Cryptographer
Why Famous: Given partial credit for the development of infinitesimal calculus.

Introduced the symbol ∞ for infinity and similarly used 1/∞ for an infinitesimal.

Wallis also served as chief cryptographer for Parliament between 1643 and 1689 and later to the royal court.

Born: November 23, 1616
Star Sign: Sagittarius
Birthplace: Ashford, England, United Kingdom

Died: October 28, 1703 (aged 86)

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