Peggy Olson

Margaret "Peggy" Olson is a fictional character in the AMC television series Mad Men, and is portrayed by actress Elisabeth Moss. Initially, Peggy is secretary to Don Draper (Jon Hamm), creative director of the advertising agency Sterling Cooper. Later, she is promoted to copywriter, the first female writer at the firm since World War II. She later joins Draper when he leaves Sterling Cooper to become a founding member of Sterling Cooper Draper Pryce. By the end of Season 4, Peggy is effectively Draper's second-in-command in the creative department. Towards the end of season five, Peggy accepts a job offer from another agency, CGC, and quits her job at Sterling Cooper Draper Pryce. However, following a merger between SCDP and CGC, Peggy finds herself working again with Don Draper.