The new role will help Channel 4 boost its ad-funded programme offering. Kearney will report into Simon Wells, the partnership controller for content solutions.
Kearney will manage the "day-to-day project and production operations and establish best practice strategies to harness the growth" of Shorts.
Before Gravity Road, Kearney founded Carson films and worked there for nine years as the executive producer. His career also includes stints at Drum PHD and Enteraction TV.
Wells said: "Simon brings an enormous range of production and delivery experience to our growing AFP content solutions team.
"He has an excellent track record in the creation and distribution of high quality TV and digital content, working closely with brands, and we’re looking forward to having his expertise on board as this format rapidly builds momentum."