“It should be clear by now that there are people who can, in fact, be reasonably considered experts; that it is rational to rely, within limits, on ex pert opinion; and that it is possible, by exercising relatively simple criteria, to gain insight into whether a particular expert is reliable or not. It is also true that experts, of course, do make mistakes, and that even the agreement of a large majority of experts in a field does not guarantee that they got it right. That’s the nature of scientific truth, as we have seen throughout this book: it is tentative, because it is the result of a human endeavor that is limited both by the type and amount of available evidence and by humans’ finite mental powers and emotional reactions. But the examples above show how you can, with a little bit of practice, tell science from bunk!”

— Massimo Pigliucci

Nonsense on Stilts (2010), Ch. 12 : Who's Your Expert?

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Massimo Pigliucci 2

chair of the Department of Philosophy at CUNY-Lehman College 1964

John Passmore (1914–2004) Australian philosopher

Source: The Perfectibility of Man (1971), p. 282.

“Experts have
their expert fun
ex cathedra
telling one
just how nothing
can be done.”

Piet Hein (1905–1996) Danish puzzle designer, mathematician, author, poet

Experts
Grooks

“Like it or not, we have placed our destiny in the hands of the experts. A politician is, after all, a kind of expert, if self-styled. Even the fact that competent experts must serve under politicians of mediocre intelligence and little foresight is a problem that we are stuck with, because the experts themselves cannot agree on any major world issue.”

Stanisław Lem (1921–2006) Polish science fiction author

One Human Minute (1986)
Context: The book does not contain “everything about the human being,” because that is impossible. The largest libraries in the world do not contain “everything.” The quantity of anthropological data discovered by scientists now exceeds any individual’s ability to assimilate it. The division of labor, including intellectual labor, begun thirty thousand years ago in the Paleolithic, has become an irreversible phenomenon, and there is nothing that can be done about it. Like it or not, we have placed our destiny in the hands of the experts. A politician is, after all, a kind of expert, if self-styled. Even the fact that competent experts must serve under politicians of mediocre intelligence and little foresight is a problem that we are stuck with, because the experts themselves cannot agree on any major world issue. A logocracy of quarreling experts might be no better than the rule of the mediocrities to which we are subject. The declining intellectual quality of political leadership is the result of the growing complexity of the world. Since no one, be he endowed with the highest wisdom, can grasp it in its entirety, it is those who are least bothered by this who strive for power.

“An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.”

Niels Bohr (1885–1962) Danish physicist

As quoted by Edward Teller, in Dr. Edward Teller's Magnificent Obsession by Robert Coughlan, in LIFE magazine (6 September 1954), p. 62 http://books.google.de/books?id=I1QEAAAAMBAJ&pg=PA62
As quoted by Edward Teller (10 October 1972), and A Dictionary of Scientific Quotations (1991) by Alan L. Mackay, p. 35
Variant: An expert is a man who has made all the mistakes which can be made in a very narrow field.