by Larry FitzmauriceBuzzFeedBuzzFeed Staff John Lithgow is speaking out - again - about the backlash against his choice to play Dumbledore in HBO's upcoming Harry Potter TV series. NBC / Weiss Eubanks/NBCUniversal via Getty Images Of course, you know that the series itself has become fairly controversial due to the involvement of Harry Potter creator J.K. Rowling, who has spent the majority of her post-Harry Potter career spending time - and money - essentially pushing back against the mere notion of trans rights.