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John Clark

Fictional character
John T. Clark is a fictional character created by Tom Clancy. He has been featured in many of his Ryanverse novels. Although he first appeared in The Cardinal of the Kremlin, his origin story was detailed in Without Remorse. Wikipedia
Aliases: J.T. Williams; Mr. Carlson; Ivan Sergeyevich Klerk
Children: Margaret Pamela Clark; Patricia Doris Clark
First appearance: The Cardinal of the Kremlin (1988)