Cheryl Graeff is an actress, writer, producer based in Chicago. She is best known for playing Dr. Givens in Chicago Fire and Sheriff Collier in Chicago Code. She was written up in the Chicago Sun Times as "One of 3 Can't Miss Stars of Chicago Stage" in 2009. She has worked at theaters around the country including: Steppenwolf Theatre Company, The Goodman, Teatro Vista, Milwaukee Repertory, Court Theatre, Nebraska Repertory, Spokane Interplayers, Idaho Theater for Youth, Trap Door, Madison Repertory, Famous Door, Strawdog, Mary-Archie, Oregon Stage Company, Chicago Dramatists, Kansas City Repertory, New American Theatre Company, American Blues Theater Company,The Kennedy Center and throughout the UK. Chicago Sun Times wrote her up as "One of 3 Can't Miss Stars of Chicago Stage" in 2009.