His first film, STEP, about a Baltimore girl’s high school step team, won the Special Jury Award for Inspirational Filmmaking at the 2017 Sundance Film Festival before being bought by Fox Searchlight Pictures for theatrical distribution. In its review of the film, Variety praised his "deft camerawork." Premiering at the 2018 Seattle International Film Festival, Casey’s second feature length documentary, Hulu’s Ballet Now, followed an ambitious New York Ballet prima ballerina. His third feature film as Director of Photography, Hood River, which tracked the season and cultural division of a high school soccer team, was slated to make its premiere at the 2020 SXSW Film Festival. His latest is Netflix’s Found, the celebrated story of three adopted teenage girls who learn they are cousins and travel to China seeking answers about their identity and family history.

Casey worked as an additional cinematographer on Between Me and My Mind, a 2019 rock doc about Phish frontman Trey Anastasio, and the 2020 Showtime feature documentary, Bad Hombres.