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Harry Callaghan (birthday: September 28), better known online as Harry101UK, is an English YouTube animator, music composer, filmmaker, gamer, and voice actor based in London, England. He is well known for creating original works and parodies of various songs mainly composed by himself using Source Filmmaker assets from the video game series Portal.
Many of his viewers have pointed out that Harry's natural voice sounds like the voice for the Portal 2 character Wheatley, who is voiced by Stephen Merchant. In addition to providing voice acting for the Portal 2 mod Portal Stories: Mel, he also made the soundtrack and promoted the game on his channel.