Frank Morrison Spillane, better known as Mickey Spillane, was an American crime novelist, called the "king of pulp fiction." His stories often feature his signature detective character, Mike Hammer. More than 225 million copies of his books have sold internationally. Spillane was also an occasional actor, once even playing Hammer himself in the 1965 film The Girl Hunters.

Michael Hammer is a fictional character created by the American author Mickey Spillane. Hammer debuted in the 1947 book I, the Jury. Hammer is a no-holds-barred private investigator who carries a Colt .45 M1911A1 in a shoulder holster under his left arm. His love for his secretary Velda is outweighed only by his willingness to kill a killer. Hammer's best friend is Pat Chambers, Captain of NYPD Homicide. Hammer was a World War II army veteran who spent two years fighting jungle warfare in the Pacific Ocean theater of World War II against Japan.