"The Punisher (Frank Castle) is an antihero within Marvel Comics' Marvel Universe, created by writer Gerry Conway and artists John Romita, Sr. and Ross Andru. The character made its first appearance in The Amazing Spider-Man #129 (February 1974).
The Punisher is a vigilante who considers killing, kidnapping, extortion, coercion, threats of violence, and torture to be acceptable crime-fighting tactics. Driven by the deaths of his family, who were killed by the mob when they witnessed a gangland execution in New York City's Central Park, the Punisher wages a one-man war on the mob and all criminals in general by using all manner of conventional war weaponry. His family's killers were the first to be slain. A war veteran, Castle is a master of martial arts, stealth tactics, guerrilla warfare and a wide variety of weapons."
Source: Wikipedia, "Punisher", available under the CC-BY-SA License.