anthologist:
(plural: ‘anthologists‘; pronunciation: the letter ‘g’ is said with a ‘j’ sound as in “judge” — for the right pronunciation, please click here)

anthologist John Gross
a person who collects poems or of other writings written by some famous writers, especially on a particular subject but from books of different authors; an anthologizer;
an editor who collects writings of different writers and poets to compile a book on a particular subject,
e.g.
John Gross, who passed away recently, was an eminent English anthologist, and he worked as a literary critic for a number of prestigious newspapers and magazines.
Frank Owen is an accomplished American anthologist, besides being an author and novelist.
