In case, like me, you didn't know who Bret Victor is,

"...Victor worked as a human interface inventor at Apple Inc. from 2007 until 2011." [1]

[1] https://en.wikipedia.org/wiki/Bret_Victor

He's actually more well known for the talks he's given and demos he's created since then. Here are a few:

• Inventing on Principle (https://vimeo.com/906418692) / (https://news.ycombinator.com/item?id=3591298)

• Up and Down the Ladder of Abstraction (https://worrydream.com/LadderOfAbstraction/)

• Learnable Programming (https://worrydream.com/LearnableProgramming/) / (https://news.ycombinator.com/item?id=4577133)

• Media for Thinking the Unthinkable (https://worrydream.com/MediaForThinkingTheUnthinkable/)

Or you could just check his website: https://worrydream.com/

He was already inspirational before that; check out Magic Ink. Because Apple won't let him share his work for that period, he isn't known for it; it's sort of like a gap in the geological record.