Quote by William Castle

An expert is a person who has made all the mistakes that can be made in a very narrow field.

— Niels Bohr

An expert is a man who has made all the mistakes which can be made, in a narrow field.

— Niels Bohr

An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them.

— Werner Heisenberg

An expert is someone who takes something you already know and makes it sound confusing.

— Evan Esar

An expert is someone who has succeeded in making decisions and judgements simpler through knowing what to pay attention to and what to ignore.

— Edward De Bono

An expert is someone who knows some of the worst mistakes, which can be made, in a very narrow field.

— Niels Bohr

An expert is someone who tells you why you can't do something.

— Alec Issigonis

Many people will tell you that an expert is someone who knows a great deal about the subject. To this I would object that…

— Werner Heisenberg

What's an expert? I read somewhere, that the more a man knows, the more he knows, he doesn't know. So I suppose one definition…

— Malcolm Forbes

An expert is someone who knows more and more about less and less, until eventually he knows everything about nothing.

— Andrew McMahon

An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.

— Nicholas Butler

An expert is one who knows more and more about less and less.

— Anonymous