He began his career writing and directing the 1999
short film 9 Across, starring
Rena Owen. In 2000, he wrote and directed his second short film,
Little Samurai. He then segued to television work, directing for series such as,
Legend of the Seeker,
V,
Criminal Minds,
The Vampire Diaries,
The Originals and
True Blood. Having had directed the first installment of the
Starz mini-series
Spartacus: Gods of the Arena, "Past Transgressions", Warn was hired as a director for the sequel series
Spartacus: War of the Damned. He ultimately directed eight episodes ("The Thing in the Pit", "Great and Unfortunate Things", "Kill Them All", "A Place in This World", "Sacramentum", "Wrath of the Gods", "Wolves at the Gate", "Mors Indecepta"). In winter 2014, Warn directed his first episode of the
DC Comics produced
Green Arrow origin series
Arrow, which was episode 19, of season 2, "The Man Under the Hood", and featured characters crossing over from the series' impending spin-off,
The Flash. Warn directed the third episode of
The Flashs first season, "Things You Can't Outrun", which featured the introduction of future superhero
Ronnie Raymond. He directed the 8th episode of
Arrow's 3rd season, "The Brave and the Bold", which again featured a crossover event with
The Flash. It also introduced the supervillain
Digger Harkness/Captain Boomerang. His next episode was with the season's twelfth, "Uprising". It explored the motivations and genesis of
The Dark Archer/Malcolm Merlyn. He directed the 17th installment of the year, "Suicidal Tendencies", from a script by co-producer
Keto Shimizu. It saw the reformation of
Task Force X, with new member
Cupid/Carrie Cutter; and explored the past of
Deadshot. in 2023 Warn executive produced and directed for the NBC series,
The Irrational. ==References==