The reason fewer people have heard of Wozniak is because he left the company 25 years ago. He doesn't get the same PR treatment from the Apple marketing fund.
Now, here are some bonus questions: You all know who invented the transistor at Bell Labs, but who invented the LASER? How about the microwave oven? FM radio?
Actually, I don't know why few people know who invented the microwave oven, since the inventor was a big-wig at Raytheon. I guess Raytheon doesn't have much of a PR department.