Mary Chieffo, who portrays L'Rell, the battle deck commander of the Klingon ship, on Star Trek: Discovery, has acting in her blood. She is the daughter of actors Beth Grant and Michael Chieffo, and, as her father did, graduated from Juilliard.

Chieffo's stage resume includes a 2015 Harlem Shakespeare Festival all-female production of Othello. Among her film and television credits are Natural Disasters, Girls!, Girls!, Girls!, The Pefect Fit (a short directed by her mother), Miss Dial, and Shelby’s Vacation.