Re: Communicating effectively with someone who talks over you?
If you're trying to train this guy to supervise other people, then his communication skills (and propensities) need an overhaul. Imagine how he will treat an underling who is trying to deliver bad / emergency / life or death type of news.
Kag123, are you a woman? Do you think he only treats women the way you describe. I agree with @Blue
clues, you don't have the luxury to be nice to him. By now, he may think that it's ok to dominate you. Tell him you have 3 points to make and then don't let him interrupt you.