Which preposition to use with describers

of Occurrences 11%

He stated that the first case of the malady had been reported by his great predecessor at Guy's Hospital, London, Richard Bright, the describer of Bright's Disease.

from Occurrences 1%

In the Sîrah (biography), the distance of the first describers from their object is the same as in the Hadîth (legislative tradition); in both we get images of very distant things, perceived by means of fancy rather than by sight and taking different shapes according to the inclinations of each circle of describers.

on Occurrences 1%

In South America these include two distinct subfamilies or generawhether they are called families, subfamilies, or genera would depend, I suppose, largely upon the varying personal views of the individual describer on the subject of herpetological nomenclature.

Which preposition to use with  describers