John T. Clark (real name John Terence Kelly) is a fictional character created by Tom Clancy. Clark is Clancy’s second most famous character after Jack Ryan. He has been featured in many of his Ryanverse novels. Although he first appeared in The Cardinal of the Kremlin (1988), his origin story was detailed in Without Remorse (1993). In film, Clark has been portrayed by Willem Dafoe, Liev Schreiber, and Michael B. Jordan, the latter in a planned series including adaptations of Without Remorse and the in-development Rainbow Six. Clark has also appeared in the Rainbow Six series of video games.