Tom Clancy's Jack Ryan is a fictional character created by the late American author Tom Clancy. He is a former Marine and CIA analyst who is often called upon to save the world from terrorist threats. Ryan has appeared in several of Clancy's novels, as well as in films and television series based on the books. Ryan is portrayed as a highly intelligent and resourceful individual who is able to think quickly and make difficult decisions in order to protect his country. He is also known for his loyalty and dedication to his job.