Which famous mathematician was controversially paid to endorse Texas Instruments' graphing calculators in the 1990s, leading to a 40% market share increase in academic settings?

The world of mathematics education has seen various marketing strategies over the years, from celebrity endorsements to innovative brand positioning. This trivia question explores how mathematical product companies have leveraged famous personalities to increase the appeal and adoption of mathematical learning tools. Test your knowledge about the intersection of mathematics education and marketing strategies!

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Andrew Wiles (after proving Fermat's Last Theorem)
Stephen Hawking (leveraging his reputation in theoretical physics)
John Nash (following his Nobel Prize and 'A Beautiful Mind' publicity)
Benoit Mandelbrot (capitalizing on the visual appeal of fractal mathematics)