"Those who can, do; those who can't, teach."

Let me modify <a title="George Bernard Shaw" href="http://en.wikipedia.org/wiki/George_Bernard_Shaw">George Bernard Shaw</a>'s famous quip[1. Or it might have been H. L. Mencken, depending on who you ask.]: "Those who can, do; those who can, but unfortunately can't because they're spending most of they're working lives managing and meeting with others, teach."

Well, that's how I like to think about.