Actor, writer, director Christopher Guest Actor, writer, director Christopher Guest. He's best known for his role as Nigel Tufnel, the lead guitarist in the mock rock documentary. This is Spinal Tap. (which just celebrated its 16th anniversary). He got his start with SCTV, and later was a part of the Saturday Night Live crew. Guest went on to make the mockumentaries, "Waiting for Guffman" about a group of amateur thespians working on a community musical, and "Best in Show" about purebreed dogs, their owners and the dog shows they compete in. This interview with Guest was recorded recently before an audience in New York as part of The New Yorker's festival of literature and the arts.