Mary Lynn Rajskub, born on June 22, 1971, in Detroit, Michigan, is an American actress, comedian, and singer. She is best known for her role as Chloe O'Brian on the action thriller series "24" and as Gail the Snail on "It's Always Sunny in Philadelphia."

Mary Lynn Rajskub comes from a family of Irish, Czech, and Polish ancestry and grew up in Trenton, Michigan, with her two older sisters. Her mother, Betty, was a pharmacist's assistant, and her father, Tony, was a pipefitter.

She attended the College for Creative Studies in Detroit and later transferred to the San Francisco Art Institute, where she graduated as a painter. She began her career in comedy and acting by performing at various open mics in San Francisco during the early 1990s. She moved to Los Angeles, where she worked as a waitress at a Hard Rock Cafe while pursuing her acting career.

Her television career took off with her role as one of the original cast members of the sketch comedy series "Mr. Show with Bob and David" in 1995. She also had a recurring role on "The Larry Sanders Show" and "Veronica's Closet" before landing her breakout role as Chloe O'Brian on "24" in 2003. Her performance on "24" earned her critical acclaim and a loyal fan base.

Mary Lynn Rajskub has appeared in numerous films, including "Dude, Where's My Car?", "Sweet Home Alabama", "Punch-Drunk Love", "Little Miss Sunshine", and "Safety Not Guaranteed". She has also performed stand-up comedy and is known for her work with the comic duo "Girls Guitar Club."

Mary Lynn Rajskub is married to Matthew Rolph, and they have one child together. She is known for her love of art and is a regular at numerous LA museums. Her own paintings have been displayed and sold at art auctions and exhibits.