Which preposition to use with exponents

of Occurrences 191%

that not only as an exponent of the beauties of nature, but as a drink, a mint-julep is far superior to the water which gives thin resort its celebrity.

in Occurrences 7%

It found its greatest exponent in Voltaire, the oracle and idol of intellectual Europe.

for Occurrences 1%

He went to them with a prejudiced mind, full of anger against their exponents for declaring the Messiah to be the Son of God.

than Occurrences 1%

To tell the truth, you will find no fairer exponent than this Stephen Holmes of the great idea of American sociology,that the object of life is to grow.

Which preposition to use with  exponents