[1] McGrath was an ensemble member and understudy for many shows, including My Favorite Year, Swinging on a Star, and Little Me.

pre-Broadway production of Finding Neverland replacing Roger Bart in the dual role of Charles Frohman and Captain James Hook.

The musical premiered at the Paper Mill Playhouse in Milburn, New Jersey on September 28, 2017, and starred McGrath as Ralph Kramden, Michael Mastro as Ed Norton, Leslie Kritzer as Alice Kramden, and Laura Bell Bundy as Trixie Norton.

While working in the Boston production of Forbidden Broadway, McGrath met his future wife, Toni DiBuono.

Michael McGrath died at his home in Bloomfield, New Jersey, on September 14, 2023, at the age of 65, 11 days shy of his 66th birthday.