“I will do my best,” he tells BBC’s “The One Show” John Lithgow attends the 31st Annual Screen Actors Guild Awards at Shrine Auditorium and Expo Hall on February 23, 2025 in Los Angeles, California (Frazer Harrison/WireImage) John Lithgow understands he might not be everyone’s first choice to play Hogwarts headmaster Albus Dumbledore in the upcoming Max “Harry Potter” series, but he’s committed to delivering a performance that will satisfy. As he told the BBC’s “The One Show” April 16, “It’s an