No matter how technical and seemingly unrelated to any literary use some bibliographical investigation is, all of it is sometime applied. And even if a bibliographer were never anything else, he would justify his existence and his technical studies by serving as the OK’er of basic documents.
Source: wiktionary
In Rochester “Sanky” Mullen was secretary of the school board and the OK’er of ordinary requisitions. He had a reputation for being a bit tough to get requisitions by.
Source: wiktionary
By reputation, no publication is more carefully assembled than The New Yorker, and none applies its own standards so fastidiously. In a fascinating recent essay entitled “Holy Writ,” longtime proofreader Mary Norris notes that at no other magazine is there a position called “page OK’er.”
Source: wiktionary