Stephanie runs her own casting company and is also Casting Director for Primary Stages. Stephanie Klapper's work has been seen on Broadway, Off-Broadway, regionally, internationally, on television, film, and heard on radio. The projects she has been involved with have won numerous awards including the Tony, OBIES, Artios, Pulitzer Prize winners/nominees, Sundance Audience Award, Cannes Prize Du Publique. and Comic Con awards.

Ms. Klapper is the resident casting director for Primary Stages, New York Classical Theatre. Selected Regional: Milwaukee Rep, Berkeley Rep, Cincinnati Rep, Goodman Theatre, The Magic Theatre, The Round House, City Theatre, Clarence Brown Theatre, Delaware Theatre Company, Capital Repertory Theatre, The Hangar Theatre, Adirondack Theatre Festival, Indiana Rep, Kansas City Rep, The New Theatre, Playmakers Repertory Theatre, Vermont Stage Company, Virginia Stage Company. Numerous independent feature films. Member of the Casting Society of America and The League of Professional Theatre Women.

Selected recent Broadway and Off-Broadway credits include: In Transit; Rosmersholm; Secrets of the Trade; The Tempermentals; Dividing the Estate (2009 Tony Nomination); an oak tree (NY Artios award winner), Indoor Outdoor. Selected regional credits: NY casting for The Cherry Sisters (Actor's Theatre of Louisville); Eric Rosen and Matt Sax's Venice; Saved! for Gary Griffen; Moises Kaufman's Into the Woods; Mary Zimmerman's The Arabian Nights; Cat on a Hot Tin Roof (Vienna); Who's Afraid of Virginia Woolf (Frankfurt).