Kristensen has served as writer-producer on multiple series including Shantaram (Apple TV+/Paramount), The Continental: From the World of John Wick (Peacock/Lionsgate TV), Echo (Disney+/Marvel), Spidey and his Amazing Friends (Disney Junior/Marvel), The Punisher (Netflix/Marvel) and Happy!

His television pilots have been developed at UCP, HBO, FX, A&E, Paramount Network, and Pivot TV.

While still in film school he was selected to both the Sundance and IFP labs, and worked as an associate producer under Gary Winick (Charlotte's Web) and Mark Waters (Mean Girls).

[1] In 2015 Kristensen co-wrote and produced the short film Ronnie BoDean with director Steve Judd, starring Wes Studi.

Marvel's The Punisher—a Netflix TV series created by Steve Lightfoot, starring Jon Bernthal, based on the comic book, began production in 2016 with Kristensen on board as a writer.

He has also written and produced pilots for HBO, FX, A&E, Discovery Channel, Paramount Network, and Pivot TV.