Remind me a great deal of what existed with Steve Jobs. Another example is Jeff Bezos with Amazon. Not saying that in tech circles some of their execs and/or engineers are not well known but certainly not people that your Aunt would have heard about. Also I guess Mark Zuckerberg and Facebook (although Sheryl Sandberg is fairly well known). Another is the "Google Guys" but you don't hear much about them lately probably because the PR has been tamped down. But early on it was every magazine cover and apparently from what I heard later Sergey wasn't even anywhere near as important as Larry was.
This happens also with VC firms. One partner (in a small firm like AVC) is the big cheese, the others you barely hear about.
That said this is not unusual in business or for that matter team sports or even entertainment. For many reason including some people simply want to be behind the scenes.