Categories Niels Bohr An expert is a man who has made all the mistakes, which can be made, in a very narrow field. Post author By quotegeek Post date May 16, 2012 No Comments on An expert is a man who has made all the mistakes, which can be made, in a very narrow field. An expert is a man who has made all the mistakes, which can be made, in a very narrow field. Tags expertise, mistakes → I’m a Sagittarius, which probably tells you way more than you need to know. Leave a Reply Cancel replyYou must be logged in to post a comment.