In 2005, he released his first album titled 7 days which included the song Don’t Give Up On Me, which featured in The OC.
Gallagher has also appeared on Broadway in numerous productions including On the Twentieth Century and Guys and Dolls.
He will star in the upcoming film Palm Springs, alongside Andy Samberg and will appear in the NBC series, Zoey’s Extraordinary Playlist as Mitch Clarke.
His most recent projects alongside Grace and Frankie include The Gifted as Benedict Ryan and Ken Scott in the film After.
Grace and Frankie is streaming on Netflix now