cgp grey is an american-irish podcaster and educational youtuber who created the podcast hello internet with fellow educational youtuber brady haran. since 2015, he also hosts the audio podcast cortex with myke hurley of relay fm. in addition to podcast production, grey is known for posting on youtube under the channel cgp grey. his youtube channel mainly features short explanatory videos on varying subjects, including politics, geography, economics, history, culture, and recently death. the channel's most popular video is an explanation of the terminology of the british isles. grey's videos have received increasing attention, having been covered by several publications, including business insider and the washington post.