Kay Cannon was born on August 21, 1974. She was raised in Custer Park, Illinois, and is the fifth of seven siblings. She graduated from Reed-Custer High School in Braidwood, Illinois, and received her BA in Theatre and MA in Education at Lewis University in Romeoville, Illinois. Cannon trained at The Second City, ImprovOlympic, and ComedySportz. One of her first jobs was as a performer at ComedySportz. She has performed sketch and improv for theaters including Boom Chicago in Amsterdam, Netherlands, The Second City in Chicago and Las Vegas, ImprovOlympic (West and Chicago) and at The Upright Citizens Brigade Theatre in Los Angeles and New York. Cannon starred in the independent film The Little Tin Man (2013). She has guest-starred on NBC's 30 Rock, New Girl, and Cristela. She made a cameo in Pitch Perfect 2 (2015) and also appeared in the comedy How to Be Single (2016), starring Rebel Wilson and Dakota Johnson. While performing and writing around Chicago, she met actress Tina Fey; a fellow Second City alumna. When Tina Fey began creating the NBC comedy 30 Rock, she brought Cannon to the writing staff. She worked her way up from staff writer to supervising producer. Cannon won the Writers Guild of America Award for Best Comedic Series for her work on 30 Rock three times. In 2008, she won a Peabody Award for her work on the show. In 2010, Cannon was nominated for an Emmy Award for Outstanding Writing in a Comedy Series. During this time, Cannon also worked as a co-producer on the feature film, Baby Mama (2008). In 2004, Cannon married American comedian Jason Sudeikis after five years together. They separated in 2008 and divorced in 2010. Cannon and her second husband, comedy writer Eben Russell, had a daughter, Evelyn Rose "Leni" Russell, in October 2013.

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