What is the history behind Late Night With David Letterman?

What is the history behind Late Night With David Letterman?

The beauty of working with David Letterman was that he had a very clear cut vision of what he wanted to do. He had done a morning show, which failed miserably, which then goes back to the question of how late night and daytime cross over. He didn't do well in daytime because it wasn't his forte. He couldn't speak to that audience. They cancelled his show, and I think it was either Fred Silverman or Brandon Tartakauff at NBC who had the vision, I think it was Silverman actually, to realize that this guy is the next Johnny Carson.