Elisabeth Singleton Moss (born July 24, 1982) is an American actor, known for her roles as Zoey Bartlet, the youngest daughter of President Josiah Bartlet, on the NBC television series The West Wing (1999–2006); Peggy Olson, secretary-turned-copywriter on the AMC series, Mad Men (2007–2015), which earned her six Emmy Awards nominations and one Golden Globe nomination; and Det.