For the record, as the owner of some of the rarest space memorabilia (including one of very few items signed by all 12 moonwalkers) I can attest that Steve Zarelli is among the best forensic autograph reviewers in the world, and is widely respected by reputable auction houses and dealers around the world. I started using Zarelli for authentication several years ago at the recommendation of several of the best known space collectors and dealers in the U.S.
and Europe. Steve will not attach his authentication to a signature unless it passes a very rigid authentication process. He rarely renders an opinion that a signature is a forgery, unless it is a precise match with known forgers.
It is a bitter pill when you have purchased a signed photograph or text with no verifiable provenance, and finding that the best authenticators won't sign off on it. And that is the basis for the handful of rants against Zarelli on this site, which I consider nothing less than unfounded slander -- which is why they are all "anonymous."