Well, Apple could be a counterpoint if we're just talking about current CEOs. Steve Jobs has never been revered for his electronics skills, and it seems he kind of snuck in the back door in early jobs at Atari and HP. His specialty was always sales, whether selling Apple computers or selling himself.
That said, if we're talking "founders," Steve Wozniak was built right in, and he's the computer guru we're looking for. Just giving the computational credit where it's due, on this one.