Mary Elizabeth Ellis: Mary Elizabeth Ellis. Actress: Masterminds. Mary Elizabeth Ellis, a writer/performer, often known for her epic recurring role as "The Waitress" on FX's long-running hit series It's Always Sunny in Philadelphia, originally hails from Laurel, Mississippi. She can be seen starring opposite Ted Danson in Mike Schur's new Netflix series A Man on the Inside. Other TV credits include Unstable (Netflix), Santa Clarita Diet (Netflix), Lodge 49 (AMC), The Grinder (Fox),...
