The book Hatching Twitter doesn't speak too highly of Dorsey, his attitude, and the way he conducts himself.
Having said that, I can't speak to how accurate it is. I don't know him, not do I know anyone who knows him. Like many books, it probably has its own angle/spin on the events it describes, even if the author was trying to be unbiased.
Keeping that in mind, it's still an interesting read. Can anyone suggest other books, articles, or blog posts that discuss Twitter's history?