James Rollins, born James Paul Czajkowski on August 20, 1961, is an acclaimed American veterinarian and writer. He is best known for his action-adventure, mystery, and techno-thriller novels. Rollins chose to leave his veterinary practice in Sacramento, California, to pursue a full-time career as an author.

Under his pen name James Clemens, Rollins has published several fantasy novels, including the popular series "The Banned and the Banished".

His works have been translated into over forty languages and have sold more than 20 million copies worldwide. Renowned for his ability to unveil unseen worlds, scientific breakthroughs, and historical secrets, Rollins crafts stories with stunning suspense. His experiences as an amateur spelunker and certified scuba diver often provide content for his novels set in underground or underwater locations.

Despite his success as an author, Rollins continues to volunteer at local animal shelters. He lives in the Sierra Nevada Mountains with his two golden retrievers, Echo and Duncan, and enjoys scuba diving, spelunking, kayaking, and hiking in his leisure time. Rollins is a sought-after writing instructor and guest speaker, frequently attending seminars and conventions worldwide.

Rollins is the founder of Authors United, a group of bestselling authors dedicated to raising funds and awareness for USA Cares, a nonprofit organization that supports soldiers and their families.