As well as his own original work, he is best known for writing novels and comic books based on licensed properties.
Mariotte was born in Park Forest, Illinois, but he moved at age six because his father, who worked for the United States Department of Defense, was transferred to Paris, France.
He has worked as the manager of Hunter's Books in La Jolla, California; co-founder and co-owner of specialty bookstore Mysterious Galaxy in San Diego; Vice President of Marketing at WildStorm Productions/Image Comics; Senior Editor at DC Comics; and was the first Editor-in-Chief at IDW Publishing.
He is the author of the series Witch Season and has also written many Charmed and Angel books based on the television shows.
[2] Other projects include the one-shot "Presidential Material: Barack Obama,"[3][4] a four-issue adaptation of the film Terminator Salvation,[5] as well as Zombie Cop, a graphic novel from the Image Comics imprint Shadowline and a novella "The Strip" set in the same fictional universe,[6] and Garrison at Wildstorm.