Survived an automobile accident at the age of 4 that killed her mother, one of her sisters and a cousin.
Took improv classes at NYU with Adam Sandler, whose last season on Saturday Night Live was her first.
Came to fame on SNL with characters like Catholic school girl Mary Katherine Gallagher and "licensed joyologist" Helen Madden.
Appeared in Sheryl Crow's 1997 video for "A Change Would Do You Good."
Has an uncredited cameo role in the 2001 Jack Black film Shallow Hal, as Hal's mother.
In 2010, she joined the Broadway cast of Promises, Promises as barfly Marge MacDougall.
In 2011, published a children's book, Tilly the Trickster, with a title character who is, in Shannon's words, "an imperfectly perfect role model," based on her own kids, who like to play (harmless) tricks. ("Embrace the silliness and fun of life," Shannon suggests.)
2017, Independent Spirit Awards — Best Supporting Female: Winner
2000, Emmy — Outstanding Individual Performance in a Variety or Music Program: Nominee
2013, Emmy — Outstanding Guest Actress in a Comedy Series: Nominee
2018, Emmy — Outstanding Guest Actress in a Comedy Series: Nominee
Stella Shannon Chestnut — Daughter
Mary Shannon Beatty — Sister
Nolan Shannon Chestnut — Son
Margaret Shannon — Mother
Katie Shannon — Sister
Fritz Chesnut — Husband
James Shannon — Father
New York University, Tisch School of the Arts, New York, New York, United States (BFA in Drama, 1987)