Mary Lynn Rajskub () (born June 22, 1971) is an American actress and comedian who is best known for portraying Chloe O'Brian in the action thriller series 24 and Gail the Snail in It's Always Sunny in Philadelphia. She was a regular cast member on HBO's Mr. Show with Bob and David, appeared in The Larry Sanders Show, Brooklyn Nine-Nine, and Veronica's Closet, and acted in films including Dude, Where's My Car?, Firewall, Sweet Home Alabama, Punch-Drunk Love, Mysterious Skin, Little Miss Sunshine, Sunshine Cleaning, Safety Not Guaranteed, and The Kings of Summer, among others. (Via Wikipedia)