After earning her B.A. in English at the University of Chicago, Katlyn cut her teeth on the Chicago storefront theatre circuit, doing everything from pitch-black comedies, to Shakespeare, to musicals, before moving to New York City. As an improviser, Katlyn trained at the PIT and went on to become a member of house teams in both sketch and musical improv. She wrote and starred in many original comedy shorts as well as sketch shows that ran at the PIT and UCB.

Katlyn originated the role of Chloe Valentine in the Tony-nominated, viral sensation Broadway musical Be More Chill. She's the lead in indie Christmas comedy Holly Star, plays multiple roles in Jon Stewart's Irresistible, starred opposite Doug Jones in My Name is Jerry, and appeared in Zach Braff's Going in Style opposite Michael Caine. She has appeared in episodes of "The Neighborhood," "iCarly," "Happy Together," "Master of None," "Billions," "The Jim Gaffigan Show," "Henry Danger," "Alternatino with Arturo Castro," and "TruTV's World's Dumbest" and "Almost Genius." Katlyn will next be seen in the upcoming HBO limited series "The White House Plumbers" opposite Woody Harrelson and Justin Theroux.