Mallory Yarnall joined the Motion Picture Editors Guild in 2014. Since then, she has been a part of the editorial department on more than 20 television series, including Netflix's Arrested Development, PBS's American Masters, and CBS's Survivor.

Recent television credits as Assistant Editor include Apple TV+'s Mythic Quest (created by Rob McElhenney, Megan Ganz, and Charlie Day) and Paramount+'s Rabbit Hole (starring Keifer Sutherland).

In 2023, Mallory was brought on as Assistant Editor at FX's It's Always Sunny in Philadelphia, and she has remained a part of the show over the subsequent seasons (earning an Editor credit during Season 16 for the episode "The Gang Gets Cursed").
 
In addition, she has served as Assistant Editor on several features—including the acclaimed documentary Unrest, which earned the Special Jury Award For Editing at Sundance in 2017, and the much-anticipated reboot of Clive Barker's Hellraiser, now streaming on Hulu.