Clive Cussler is the author or co-author of twenty previous bestselling books. Cussler is the world's foremost author of maritime thrillers. His many bestsellers include Inca Gold, Atlantis Found and Valhalla Rising. Cussler is one of the world's most respected maritime diving experts and has formed a charitable institution, NUMA, the National Underwater and Marine Agency which searches for lost ships of historic significance. NUMA is also the name of the government agency in the author's New York Times bestselling Dirk Pitt adventure books. Cussler divides his time between Arizona and Colorado.
Craig Dirgo is the author of the John Taft spy thriller series, and an adventure novelist. He has co-authored with Clive Cussler on a range of non-fiction adventure books. He is a trustee of NUMA, the National Underwater and Marine Agency, founded by Clive Cussler.