Maggie Smith (Minerva McGonagall)
Perhaps one of the biggest stars of the Harry Potter cast, Dame Maggie Smith needs no introduction. As Professor McGonagall, the eventual headmistress of Hogwarts, she introduced herself to a whole new audience.
Even at her age, Dame Maggie Smith has worked tirelessly. She won a Golden Globe and an Emmy for her role as Violet Crawley on Downton Abbey.
Currently, the actress has just wrapped up work on a film Downton Abbey which acts as a continuation of the show as well as working on A Boy Called Christmas which is set to come out in 2020.