Charlie McDonnell is a British filmmaker, screenwriter, musician, former vlogger, author and Twitch streamer from Bath, Somerset. On 15 June 2011, her YouTube channel charlieissocoollike became the first in the United Kingdom to reach one million subscribers.

William Henry Green II is an American YouTuber, science communicator, novelist, and entrepreneur. He produces the YouTube channel Vlogbrothers with his older brother, author John Green, and hosts the educational YouTube channels Crash Course and SciShow. He has advocated for and organized social activism, created and hosted a number of other YouTube channels and podcasts, released music albums, and amassed a large following on TikTok.