Will keep writing more on why for each one of them. The list goes from an all time programming great to some 20 year olds, but it's important to look up to not only who have made it, but also to people who are going to make it.
What do I mean by making it? Idk, I think these people are probably incredibly content day to day immersed in creative workflows or some hard problems.
Linus Lee
Just take a look at his projects page. TLDR - he built his own programming language, and then uses that language to build his other side projects which range from a ray tracer to a to-do lists app.