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August 25, 1965
|Other names||Arnold Cassius|
|Occupation||Television director, producer|
He got his start on the 1992 horror feature Doctor Mordrid, as the first assistant director. He went on to serve as assistant director on several other films such as From Dusk till Dawn, Living Out Loud, The Faculty, and Spy Kids.
Aarniokoski has directed 8 installments of the CBS series Criminal Minds since 2011, while directing two episode of The CW's Green Arrow origin series Arrow, and one of its sister-series, The Flash.
During the first season of the FOX series Sleepy Hollow, Aarniokoski directed the 7th episode, "The Midnight Ride". In winter 2014, he joined as supervising producer and main director on the show. He has since directed the second-season episodes "Go Where I Send Thee...", "And the Abyss Gazes Back", "Kali Yuga" and "Awakening".
- "*EXCLUSIVE* Interview with CM Director Doug Aarniokoski!". Criminal Minds fansite. Retrieved October 16, 2014.
- "Douglas Aarniokoski". TV.com. Retrieved October 16, 2014.
- "LIMITLESS: Heather Kadin on Bradley Cooper's Involvement, and Why It's 'SLEEPY HOLLOW 2.0'". Give Me My Remote. May 26, 2015. Retrieved September 18, 2015.