Peggy Olson.

About Peggy Olson

Margaret "Peggy" Olson is a fictional character on the AMC television series Mad Men. She was portrayed by Elisabeth Moss and served as the show's female lead. Initially, Peggy is secretary to Don Draper, creative director of the advertising agency Sterling Cooper. She soon discovers her passion for copywriting and due to her talent, Draper takes her on as his protégée. She is eventually, albeit temporarily, placed in authority over Draper much to his disdain. Her rise is an integral part of the series and plays a key role in every season of Mad Men. After Don, she has the highest number of episode appearances, appearing in 88 out of the 92 episodes.