Elisabeth Singleton Moss is an American actor and producer. She is known for her work in several television dramas, garnering many accolades, including two Primetime Emmy Awards and two Golden Globe Awards, which led Vulture to name her the "Queen of Peak TV".

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 protégé. 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.