There's an overwhelming temptation to include blurbs, or quotes, in your query letter. "So and So said this fabulous thing about my novel!"
I understand that you want me to know people other than your mom or your clever dog have read Fabulous Novel and liked it.
And it's fine to include those things if you can't resist (I pay no attention to them, just so you know.)
What you need to remember about those blurbs is that they are effective only if:
I know the person lauding you.
Not necessarily personally, but at least by name. At the very worst, if I google "Lauder's Name" and "author" and I don't find anything, this is a useless blurb.
The corollary of this rule is that you must use the person's name. Both of them. HoneyPie, a reader, is useless. As is Famous Novelist who wishes to remain anonymous.
Also useless is a professional designation without a name. I see this a lot from people who are querying for novels they entered in the Amazon Breakout Novel contest: PW said this and that about Fabulous Novel.
If you don't know this you should: PW did not say that about your novel because it was not printed in the pages of Publishers Weekly. A person working for PW read contest entries and made comments. Those two are NOT the same thing.
It helps if you put the name in context as well. Example: "Sophie Littlefield read my manuscript as part of a critique group. I know you adore Sophie, and she adored Fabulous Novel (insert quote here.)"
If you take a class from a famous writer or editor who reads your book, you mention that's how they read it: Mrs PiggleWiggle read my novel when I took her class on Fascinating Dialogue and she said (insert quote here)
The bottom line is that introductions or references aren't needed but if you can't resist including them at least make them effective: full name, quote, context of how the quote was obtained ALL need to be there:
Janet Reid, SharklyAgent, read my blog post and says "Too kind. Be meaner" when I accosted her at the local watering hole and held her scotch bottle hostage.