Dermot Morgan was best known outside Ireland for Father Ted, but for a more accurate impression of his wide range of talents as a comedian and satirist, some representative places to start would be The Live Mike and Scrap Saturday.
More information on Dermot is available in the biography Our Father by Don, Rob, and Ben Morgan; secondhand copies can be found online. Some of the information in this book is inaccurate, although not as inaccurate as his Wikipedia page, which I’m not linking to because, as the saying goes, it’s shite.