When I write a book jacket blurb, I always go on the assumption that the reader knows nothing...doesn't know who the author is, doesn't know who the blurb-writer is. I know ninety-nine percent of people reading my blurb don't know Charles Edward Pogue, which is why I always slug my blurbs with my screenplay credits. They may not know me but they might have seen one of my movies. They may not know Rupert Holmes, but seen one of his plays or heard one of his songs. It's our credits that give us any credibility as a blurb writer, more than our names (unless your name happens to be Stephen King or John Grisham or Steven Sondheim).
When writing my blurb, maintaining the assumption the reader has never heard of the author (again, if your John Grisham or Stephen King, you don't need a blurb endorsing your work), I try to convey some reason in the body of the blurb, why the reader might want to get to know him.
But the blurb should always be about the author; not the blurb writer.
