Mathematician Zvezdelina Stankova was born in Bulgaria and is now a teaching professor at UC Berkeley.

Zvezda's webpage - https://math.berkeley.edu/~stankova/

Zvezda videos on Numberphile - https://www.youtube.com/playlist?list=PLt5AfwLFPxWIbAPK1oJgRIpe0sWiPKkQ4

The Legend of Question Six - https://www.youtube.com/watch?v=Y30VF3cSIYQ

Berkeley Math Circle - https://mathcircle.berkeley.edu

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