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Professor Armando Dippet was born in 1637 and died in 1992. He became the headmaster at Hogwarts School of Witchcraft and Wizardry in the 1940s and served well into the 1960s until he was succeeded by Albus Dumbledore. It was during his time as headmaster that the Chamber of Secrets was opened by Tom Riddle (also known as Lord Voldemort) for the first time since being sealed by its creator, Salazar Slytherin, in 993 C.E. Headmaster Dippet was particularly fond of Riddle and had no idea that he was, in fact, a very troubled boy with sinister intentions. He unknowingly put a stop to the attacks during this time by announcing that the school would be closed if the attacks did not end. This debacle resulted in the framing and expulsion of Rubeus Hagrid, who later became the school’s gamekeeper.

As headmaster of Hogwarts, Professor Dippet was a very strict and firm leader. He was known to allow severe and corporal punishments on students. He was also rather hard on the other professors as well, and was quick to place teachers on probation for unsatisfactory behavior or results. He was also responsible for the permanent ban on pantomimes as a result of a chaotic performance of “The Fountain of Fair Fortune” that resulted in a fire in the Great Hall and landed several people in the Hospital Wing. Others say that because of this, he was a very cautious man who took the safety of his students very seriously.

A chocolate frog card was made of Professor Dippet in 1961, and following his death, his portrait was hung in the Headmaster's office where he remains, serving whomever becomes headmaster. His portrait depicts him dressed in blue and bronze robes, the colors of his house, Ravenclaw. He had pale skin and brown eyes, and his portrait depicts him in his elderly years of frailty, although it was made before his balding began.