Richard Ivan Mack is an American politician who served as the sheriff of Graham County, Arizona from 1988 to 1996. A former lobbyist for Gun Owners of America, he is known for his role in a successful lawsuit which alleged that portions of the Brady Handgun Violence Prevention Act violated the United States Constitution. Mack is also the founder of Constitutional Sheriffs and Peace Officers Association and sits on the board of directors of the Oath Keepers.