John Reese is a fictional character from the television series Person of Interest, which aired from 2011 to 2016. He is portrayed by actor Jim Caviezel and is a former CIA operative with exceptional skills in combat and surveillance. Reese is recruited by billionaire Harold Finch to help prevent violent crimes in New York City using a supercomputer known as The Machine. Throughout the series, Reese struggles with his past while working to protect innocent lives. His character embodies themes of redemption and justice, often putting himself in danger to save others. The show combines elements of action, drama, and science fiction, making Reese a compelling protagonist.