Mr. Garrison (Herbert Garrison) is a main character from the animated series South Park, known for his role as a fourth-grade teacher and his evolving, often controversial, personal life, which includes a sex change to become Mrs. Janet Garrison and a brief stint as President of the United States. Voiced by co-creator Trey Parker, he is characterized by his bigotry, mental instability, and use of puppets like Mr. Hat & Mr. Twig to express his inner thoughts, evolving from a closeted homosexual.