James Rollins, the pen name of Jim Czajkowski, is a renowned American author known for his action-adventure/thriller, mystery, and techno-thriller novels. A former veterinarian, Rollins gave up his practice in Sacramento, California, to become a full-time author. His background as an amateur spelunker and a certified scuba diver enriches his novels, often setting them in captivating underground or underwater locales.

Under his pseudonym, James Clemens, Rollins has also published fantasy novels, including the notable series 'The Banned and the Banished' and 'The Godslayer Chronicles'. His writing has garnered significant acclaim, selling more than 20 million books worldwide and being translated into over forty languages. The New York Times described him as a blend of Michael Crichton and Dan Brown, while NPR praised his work as "Adventurous and enormously engrossing."

Rollins shares his life in the Sierra Nevada Mountains with his two golden retrievers, Echo and Duncan. He continues to volunteer at local shelters, showcasing his enduring compassion for animals. An avid adventurer, Rollins enjoys scuba diving, spelunking, kayaking, and hiking. His travels around the world often inspire the global settings of his thrilling narratives.

Before embarking on his literary career, Rollins pursued veterinary medicine, graduating from the University of Missouri and establishing a successful practice. This hands-on knowledge of medicine and science infuses his books with authentic research and scientific speculation, setting his work apart in the realm of action-adventure literature.

Rollins is the bestselling author of the Sigma Force series, several individual adventure thrillers, and the blockbuster movie novelization Indiana Jones and the Kingdom of the Crystal Skull. He is also the founder of Authors United, a collective of bestselling authors committed to supporting USA Cares, a nonprofit organization aiding soldiers and their families.