After graduating from Ohio State University, Kristen moved to New York City in 2007 joining the Upright Citizens Brigade. Ruhlin, then performed, The O’Neil readings at Provincetown Playhouse and soon to follow was a lead role in the play, The Danaides, a Yale Drama Alumni production, in which Ruhlin was the only non Yale Alumnus performing.

Kristen started her film career with a small role in the Tribeca Film Festival selected, Descent, and a small role in Pulitzer Prize Winner, David Aburn’s directorial debut, The Girl in the Park, starring Sigourney Weaver, Kate Bosworth and Keri Russell. In 2010, Ruhlin, starred opposite Josh Gad in She Wants Me, followed by the dark indie, Missing Child. In 2014 Ruhlin had a small role in the comedy, Someone Marry Barry, with Tyler Labine, Thomas Middleditch and Lucy Punch. Ruhlin produced the indie thriller, Roomate Wanted, in 2015 starring Alexa Vega and Spencer Grammer.