Mr. Mason was a builder who Vernon Dursley was hoping to get a big drill order from. On the 31 July, 1992, Mr. Mason and his wife were dinner guests at the Dursley home. The evening was nearly ruined when, the dessert Petunia Dursley had made crashed to the floor (an incident blamed on Harry Potter though it was actually Dobby's fault). The evening could have been rescued were it not for the barn owl that flew through the open window and dropped a letter on Mrs. Mason’s head. Mr. Mason then informed the Dursleys that his wife was mortally afraid of birds. He then left their home quickly following after his screaming wife.
Behind the scenes
- Mr. Mason was portrayed by Jim Norton in the film adaptation of Harry Potter and the Chamber of Secrets.
- In the film adaptation of Harry Potter and the Chamber of Secrets, the pudding, levitated by Dobby, crashed down on Mrs. Mason's head, ruining the dinner party and causing Vernon Dursley to lock Harry in his bedroom also instead of the Ministry owl letting fall a letter on Mr. Mason's wife. Pentunia, Vernon's wife, said: "Would you like some ice cream, Mr. and Mrs. Mason?"
- In a deleted scene, Mason was said that he was a wonderful golfer and he says that he plays occasionally.
English word mason means "bricklayer".