I've acquired the expertise with presentations through work. I did not have formal training, but I knew the basics. After I've got the opportunity to work with presentations I quickly began to explore everything in PowerPoint and I became an expert. Although I don't use other applications such as Keynote, I'm very familiar with it. The examples here reflect a little bit of the work I've done over the years and they include diagrams, charts, and miscellaneous elements. I've also done animations and other media that are not shown here.