Which preposition to use with phrenologist

as Occurrences 1%

His body was examined by several eminent pathologists: his brain is stated to have presented a mass of extraordinary volume, weighing three pounds thirteen and a half ounces; a fact which will be treasured up by contemporary phrenologists as evidence of Cuvier's great intellectual capabilities.

by Occurrences 1%

A phrenologist by profession, so he said, he had resorted to barbering simply for amusement, and under the circumstances he would give me a professional sitting gratuitously.

Which preposition to use with  phrenologist