Clive Cussler is the author or coauthor of over fifty previous books in five bestselling series, including Dirk Pitt®, NUMA® Files, Oregon® Files, Isaac Bell, and Sam and Remi Fargo. His nonfiction works include Built for Adventure: The Classic Automobiles of Clive Cussler and Dirk Pitt, and Built to Thrill:More Classic Automobiles from Clive Cussler and Dirk Pitt, plus The Sea Huntersand The Sea Hunters II; these describe the true adventures of the real NUMA, which, led by Cussler, searches for lost ships of historic significance. With his crew of volunteers, Cussler has discovered more than sixty ships, including the long-lost Confederate ship Hunley. He lives in Colorado and Arizona.    Dirk Cussler joined his father in writing the Dirk Pitt novels in 2004 with the publication of Black Wind and Treasure of Khan. He has been a team leader in the real-life NUMA expeditions and has served as President of its Board of Trustees. Dirk holds an MBA from Berkeley and lives in Arizona.