He played the character Schroeder in the 1999 revival of Clark Gesner's You're A Good Man, Charlie Brown.
Additional Broadway credits include the revival of Wonderful Town, Jelly's Last Jam, and Oh, Kay!.
[1] In 1997 Mathis appeared as Banzai in the original Broadway cast of The Lion King, a musical adaptation of the 1994 Disney animated film of the same name.
[3] He starred on Broadway in the musical comedy Nice Work if You Can Get It costarring Matthew Broderick and Kelli O'Hara.
In October through November 2023, he starred playing the role of Meyer Wolfsheim in Paper Mill Playhouse's world premiere of The Great Gatsby, an adaption of the Fitzgerald novel of the same name.