Stephen Colbert is a comedic actor and satirist who has his own self-titled show on the cable channel Comedy Central. He is a long-time fan of Tolkien's works and reads Elvish. He appeared in a cameo as a Lake-town spy for The Hobbit: The Desolation of Smaug and is rumored to appear for the third sequel. In the beginning stages of him announcing he was going to be in the first Hobbit sequel, he was thought to be playing an Elf with no dialogue.
Prior to the first Hobbit installment coming out, Colbert had stars like Ian McKellen and Martin Freeman appear on his show to discuss and promote the film. Both stars ended up seeing just how huge a Tolkien fan Colbert really was.