Peter "Pete" Campbell (Vincent Kartheiser) is an ambitious young account executive whose father-in-law controls the advertising for Clearasil, a Sterling Cooper account.
Joan P. Harris (née Holloway; Christina Hendricks) is first depicted as an office manager at Sterling Cooper, who acts as a professional and social mentor, as well as an occasional rival, to Peggy Olson, much as Don Draper is to Pete Campbell.