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. In anticipation of The Hobbit: The Battle of Five Armies, he interviewed Smaug on his show.
Peter Jackson when talking about Colbert has said, "I have never met a bigger Tolkien geek in my life … Philippa Boyens is our resident Tolkien expert, and when Stephen came down to visit the set, we put him head to head with Philippa on a Tolkien quiz–and Stephen triumphed. I have to say, his encyclopedic knowledge of Tolkien is spectacular, and points to a deprived childhood in some respects.”