The man who decides something is possible, then builds the way to it.
See his storyBorn in Pretoria in 1971, he taught himself programming as a child. At 12 he built a space-shooter game called Blastar and sold the code for around $500.
At 17 he left South Africa for Canada, then moved on to the United States.
He founded SpaceX in 2002 to make spaceflight cheaper. The first three Falcon 1 launches failed, and the company was close to running out of money.
In September 2008 the fourth launch reached orbit. A few months later NASA awarded SpaceX a major cargo contract.
Rockets were thrown away after one flight. In December 2015 a Falcon 9 first stage returned and landed upright, proving that a rocket could be reused.
Meanwhile, Tesla, where he became CEO in 2008, turned electric cars into a mainstream product.
Not his fame. His habits.
Pick a goal that sounds unrealistic, then break it into solvable problems.
Three failures did not end SpaceX. The fourth launch changed its future.
Ask what a thing is really made of, not just how it has always been done.