T. R. Knight T.R. Knight (b. 1973), who played George O'Malley on the TV show Grey's Anatomy, appeared as "Private I" in Episode 4120 of Sesame Street. Knight also appeared with Elmo on The Tony Danza Show. External links IMDb Wikipedia has an article related to: T.R. Knight Retrieved from "https://muppet.fandom.com/wiki/T.R._Knight?oldid=1077022" Categories: Celebrities Sesame Street Guest Stars Community content is available under CC-BY-SA unless otherwise noted.