Brady John Haran OAM (born 18 June 1976) is an Australian-British independent filmmaker and video journalist who produces educational videos and documentary films for his YouTube channels, the most notable being Periodic Videos and Numberphile. Haran is also the co-host of the Hello Internet podcast along with fellow educational YouTuber CGP Grey. On 22 August 2017, Haran launched his second podcast, called The Unmade Podcast, and on 11 November 2018, he launched his third podcast, The Numberphile Podcast, based on his mathematics-centered channel of the same name
Caitlin Alexandra Hill (born 8 September 1988) is an Australian YouTube personality under the name TheHill88. She produces, edits and uploads her videos from her home in Brisbane, and since 2008 from New York City.
Dubbed "the goofy princess of cyberspace" by Australia's version of 60 Minutes, Hill maintains a channel on YouTube. Her videos have a cumulative view count of over 17 million.
In addition to maintaining a channel on YouTube, Hill is the Chief Creative Officer of Hitviews, a website and new media business venture, which she co-founded with Walter Sabo. The site allows marketers direct access to internet celebrities such as Kevin Nalty and Cory Williams. Bob Weinstein is among the site's investors