Dien -

When I was in grad school, a group of the business professors decided to "help" a minority business improve its practices and profitability. The business went out of business with their "help"! Unfortunately, they just went back to the halls of academia, while the poor owner went on welfare!

That was an early lesson to me about "book expertise" and experience expertise. In my opinion, true experts have both, and continue to learn from both.

I've seen the definition, "An expert is someone dead from the neck up", implying they've stopped learning. Certainly applied to my old prof's:-)

Bob