Answer
Minerva McGonagall was portrayed by Maggie Smith in the Harry Potter film series. McGonagall is a stern but fair professor at Hogwarts School of Witchcraft and Wizardry, who serves as the Head of Gryffindor House and the Transfiguration teacher. She is a powerful witch and a close confidante of Albus Dumbledore, the school's headmaster. Smith's portrayal of McGonagall is highly acclaimed for its wit, warmth, and authority.