David J. Bradley (born 1949) was one of the twelve engineers who worked on the original IBM PC, developing the computer's ROM BIOS code. He is most famous for inventing the "Control-Alt-Delete" (also known as three-finger salute) key combination that was used to reboot the computer.
David Bradley (born April 17, 1942) is a British character actor. He has recently become well known for playing the caretaker of Hogwarts, Argus Filch, in the hugely popular Harry Potter series of films.
David Shedd Bradley (6 April 1920 - 19 December 1997) was an American motion picture director, actor, film collector, and university instructor.