Who is the anonymous comedian criticizing Rolling Stone's comedy issue?

Rolling Stone just published online a letter the magazine received from a comedian who appears in the current comedy issue, "What's So Funny?" And we quote:

The issue made me sick. The majority of the people in it are, for the most part, the worst sort of comedy whores, and you, as a magazine, are a pimp. I don’t know a more polite or politic way to put it. They soulleslly (sic) perform what should be sacred rituals in return for sums of money. Whores.

This is from someone claiming to be quoted/featured in the issue, mind you. I have the issue in a stack of things I need to read, so I don't know the comedian's identity. Do you? Any guesses? Please feel free to comment.

Comments

[Keith Whitener]

Sounds like someone unfunny!