Mark Greaney has a degree in international relations and political science.
In his research for the Gray Man novels, including Relentless , One Minute Out, Mission Critical, Agent in Place , Gunmetal Gray , Back Blast , Dead Eye , Ballistic , On Target , and The Gray Man , he traveled to more than thirty-five countries and trained alongside military and law enforcement in the use of firearms, battlefield medicine, and close-range combative tactics.
He is also the author of the New York Times bestsellers Tom Clancy Support and Defend , Tom Clancy Full Force and Effect , Tom Clancy Commander in Chief , and Tom Clancy True Faith and Allegiance .
With Tom Clancy, he coauthored Locked On , Threat Vector , and Command Authority .
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