Even if you've never heard of Jack Dorsey, you've probably used something he's built. Although Jack doesn't spend much time in the spotlight, he's hit two major start-up home runs with micromessaging service Twitter and mobile payment system Square. The former has enabled revolutions, and the latter has revolutionized small businesses.
The Twitter cofounder and Square CEO has already left his mark on the Silicon Valley tech scene but is looking to take on something a little bigger: New York City. Jack discussed his past affinity for police scanners, current responsibility leading two companies, and future political ambitions @jack and watch the full 60 Minutes interview in the gallery.