Steve Jobs
Wouldn't that require taking out religion? Because wouldn't a highly advanced technological wonder be seen by early civilizations as some sort of god?
Actually, we'd all have free ipods by now...Everything would be dumbed down, white, and expensive with old hardware.
What you would want to do, actually, is take Gutenberg with his idea for the printing press, and put him back into a non-theocratic pre-Christian civilization. Greece under Pericles, for example.
That would probably do an excellent job of jump starting technology.