A New Yorker article by Malcom Gladwell, one of my favorite writers, really gets to the heart of who Steve Jobs was as a person. Jobs, Gladwell says, relentlessly tweaked things. He didn't invent, he tweaked. And tweaked. And tweaked. Until it was perfect. He sometimes drove people crazy, but it was this aspect of his personality that led to Apple's success. Gladwell, using details from Walter Isaacson's biography, tells how the tweaking even spilled out into Jobs's personal life.