Actually I think "professional" fits. Or at least it used to, in its older definition. Per Mr. Justice Brandeis:

The characteristics of a profession are that it seeks to
--preserve a body of knowledge
--expand the body of knowledge
--teach the body of knowledge
--set standards of practice and enforce them
and
--value performance over reward

These aspects have been largely cheapened and diluted recently, I fear, now that everybody's a professional. But that's what it was supposed to mean.