List of Books by Mark Greaney. See all books authored by Mark Greaney
Tom Clancy
Mark Greaney
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Command Authority book by Tom Clancy , Mark Greaney
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About Mark Greaney
Mark Greaney has a degree in International Relations and Political Science. In researching The Gray Man series he traveled to ten countries and trained extensively in the use of firearms, battlefield medicine, and close range combative tactics.