His audiobook work includes Stephen Chbosky's The Perks of Being a Wallflower and Matthew Quick's Forgive Me, Leonard Peacock.

[12] Galvin joined the Broadway production of Waitress, playing Ogie from April 29, 2019, to August 18, 2019, after which Todrick Hall took over the role.

In 2020, Galvin joined the fourth season of the television series The Good Doctor in the recurring role of Dr. Asher Wolke.

[17][18][19] The movie soundtrack featuring original songs written by Galvin, Platt, Gordon, and Lieberman was released on the same day by Interscope Records.

[20] For his role of Glenn Winthrop, Galvin received a Best Supporting Performance nomination at the 39th Independent Spirit Awards.

In December 2022, Galvin starred in Meet Cute's holiday romantic comedy, Christmasuzannukkah, with Amy Sedaris.

"[21] On August 29, 2024, it was announced that Galvin would star alongside Beanie Feldstein and Kevin McHale in the Kennedy Center's production of The 25th Annual Putnam County Spelling Bee from October 11-20, 2024.