I think it's jumping the gun to assume this guy was an editor. From the About Us page of the agency website:
"During my time in New York City, I gained experience in the editorial departments at both Farrar, Straus and Giroux and William Morrow/HarperCollins, with a brief interlude in the marketing department of Harper Perennial."
Prestigious publishers indeed. However, he doesn't say what kind of editorial experience, or how long these jobs lasted. He may have been an administrative assistant, or possibly a temp (if he actually worked as an editor, why not simply say so?), or held the jobs for only a few months (saying that he moved to NY "during the most difficult time to find a job in publishing since the inception of the printing press" suggests sometime during the economic downturn of 2008, which in turn suggests pretty short tenures)--in which case I'd question the amount of relevant experience he gained.
I'm not questioning the intent here, just the level of expertise.
- Victoria