|Born||November 7, 1992|
|Education||Juilliard School (BFA)|
|Television||Star Trek: Discovery|
Chieffo was born and grew up in the neighborhood of Valley Village, Los Angeles in California, only daughter of actors Michael Chieffo and Beth Grant. Her acting debut was at the age of three when she played a sleeping girl in Sandra Bullock's short film Making Sandwiches, in which her mother also had a role, and later acted in various TV shows and short and feature films.
She attended the Drama division of Juilliard School in New York City, earning a Bachelor of Fine Arts degree in 2015. One of her classmates was future Star Trek: Discovery castmate Mary Wiseman. Her first high profile acting position was on Star Trek: Discovery, where she played the recurring character of L'Rell, a Klingon warrior and spy who becomes leader of the Klingon Empire at the end of Season 1.
|1998||Making Sandwiches||Sleeping baby (Uncredited)||Short|
|2007||Welcome to Paradise||voice actress|
|2008||Natural Disasters||Young Beth|
|2009||Jack and Janet Save the Planet||Tina Grotunski||Television movie|
|2011||Girls! Girls! Girls!|
|2012||The Perfect Fit||Shop Girl||Short|
|2013||Miss Dial||Teenage Girl Stranger|
|2017||The Mindy Project||Micaela||chapter: "Jeremy & Anna's Meryl Streep Costume Party" (season 6 episode 5)|
|2017–19||Star Trek: Discovery||L'Rell||recurring character|
- "Mary Chieffo on Twitter". Retrieved August 28, 2018.
- "At Home With Beth Grant". HGTV. Retrieved November 4, 2016.
- "Mary Chieffo". IMDb. Retrieved March 26, 2018.
- "'Star Trek: Discovery's' Mary Chieffo transforms into Klingon L'Rell". USA Today. September 25, 2017.
- "Juilliard Students Form G44 Productions, Release First Short Film". Broadway World. New York City. June 5, 2013.
- "When Star Trek Makes You a Star: A Tale of Two Classmates Reaching New Heights With Discovery". E! Online. November 10, 2017.
- "'Star Trek: Discovery' Casts Klingons Chris Obi, Shazad Latif, Mary Chieffo". Variety. December 12, 2016.