Charlie Chaplin was a pioneer in the early days of Hollywood and became the most recognized face on the planet with a career spanning 40 years.
Gene Kelly was the most creative and athletic dancer of his time and pushed the boundaries of dance on film.
Steve Jobs revolutionized digital entertainment with technological innovation and pushing a major shift in media consumption by breaking the hold of the music and movie moguls.
See also: www.boldbrashandbrilliant.com
Publicly answering an email over at his site, Apple co-founder Steve Wozniak goes into a few details on Steve Jobs's technical background.
"Steve didn't ever code," writes Wozniak. "He wasn't an engineer and he didn't do any original design, but he was technical enough to alter and change and add to other designs."
This is a characteristic that we see referenced time and time again in Walter Isaacson's biography on Jobs. He was perpetually retooling his employees' work, never shy about having them change it or otherwise improve it based on what he knew would work.
Nonetheless, it's odd that Jobs himself never learned to do the hands-on work he asked his employees to do. Today's big tech moguls, like Facebook's Mark Zuckerberg and Tumblr's David Karp, cut their teeth writing their own code.