Won a role on "Hickory Hideout", a children's television program that aired in Cleveland, Ohio.
Has two children with her husband Ethan Sandler: Leonard Sandler (born October 2006) and Mae Sandler (born July 27, 2009).
Her role on Crossing Jordan (2001) as Lily Lebowski had her playing opposite her husband, Ethan Sandler. Ethan played Jeffrey Brandau, Lily's fiancé on the series. During the season 6 taping of "Crossing Jordan", Kathryn was pregnant with their first child.
She has worked separately with three Friends (1994) actors: Jennifer Aniston, Paul Rudd and Christina Applegate.
Auditioned for the role of Pam Beesly on the NBC sitcom The Office (2005), which went to Jenna Fischer.
Attended Northwestern University, where she received her Bachelor's degree in Theatre.
Attended the Yale School of Drama in New Haven, Connecticut, but did not graduate.
Lives in Los Angeles, California, where she paints and practices yoga when she's not busy acting.
George Hahn is her cousin.
Her surname is German and means "rooster".
She worked as a waitress before starting acting.