Daniel David Stewart is an American singer and actor known for his work in television, theatre, and musical productions. In 2015, he provided the voice of Ernst in the Broadway revival of Spring Awakening. The following year, he originated the role of Papi in the world premiere of The Band's Visit at the Atlantic Theater Company. In 2019, Stewart portrayed Milo Minderbinder in the Hulu miniseries Catch-22, directed by George Clooney. From 2021 to 2022, he appeared as NASA astronaut Nick Corrado in the Apple TV science fiction drama series For All Mankind.