Which famous mathematician served as the brand ambassador for Texas Instruments' graphing calculators in the 1990s, appearing in print ads with the tagline 'Calculate the Possibilities'?

Many mathematicians have crossed over into the world of product advertising, bringing their analytical minds to marketing campaigns. Some have become brand ambassadors for educational products, technology tools, or even mainstream consumer goods that emphasize precision and intelligence. This trivia tests your knowledge about the intersection of mathematics and marketing - where logical minds help build brand value through carefully calculated campaigns.

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Andrew Wiles (who proved Fermat's Last Theorem)
John Nash (subject of 'A Beautiful Mind')
Benoit Mandelbrot (pioneer of fractal geometry)
Stephen Hawking (theoretical physicist and mathematician)