When we last saw ladder-climbing copywriter Peggy Olson on the 1960s-set TV show Mad Men, she'd just scored her own account and an office. Life's also pretty sweet for Elisabeth Moss, the actress who plays Peggy: In July, a few months after getting engaged to Saturday Night Live star Fred Armisen, Moss was nominated for a best actress Emmy. And recently, Moss has been filming episodes for Mad Men's third season (premiering Aug. 16 on AMC). LIFE chatted with the actress during a break in L.A., where she studied our photos of 1950s and '60s work culture -- scenes where her plucky Peggy would fit right in -- and selected her 10 favorites.