Albert Runcorn was a tall, bearded wizard who works for the Ministry of Magic. He unwittingly played a part in Harry, Ron, and Hermione’s infiltration of the Ministry when Hermione gave him a Nosebleed Nougat, convinced him to go home, and took some of his hairs to add to Polyjuice Potion for Harry (DH12).
Informing on Muggle-borns to the Ministry.
Runcorn = the name of a town in Cheshire, England, of which the earliest mention is in the Anglo-Saxon Chronicle, where it is spelled "Rumcofan", literally meaning "a wide cove or bay". Derived from the Old English words "rúm" ("wide") and "cofa" ("cave" or "cove").
Albert Runcorn is played by David O'Hara in Harry Potter and the Deathly Hallows Part 1 (IMDb).