Your most effective meeting on user interface design is the one where you show your boss or client what you can do. Rather than telling them, or stating what you have done for others, demonstrate what you can do for them. We have helped prospective clients improve their design and usability at the first meeting before agreements are made and contracts are signed. We have even helped others via email links and screenshots. We believe in intuitive interfaces for all and have benefited from this. Nothing will turn your boss or client into a believer quicker than solutions to their needs.
Everyone wants improvements and everyone has 15 minutes. Go on, show them what you can do.