The Lord John Grey series is a spin-off of the Outlander series by American novelist Diana Gabaldon. After making appearances in Dragonfly in Amber, the Lord John Grey character appeared in subsequent Outlander novels Voyager, Drums of Autumn, A Breath of Snow and Ashes and An Echo in the Bone.
Diana Gabaldon is an American author of a wide variety of genres, including romance, historical fiction, mystery, adventure and sci-fi. She is best known for her Outlander series. She has also written several books in the Lord John series, short stories, novellas, graphic novels and collaborative novels.