Cynthia Cosgrove (Larisa Oleynik) (née Baxter) is Ken Cosgrove's wife and the daughter of Ed (Ray Wise), the CEO of Corning. Cynthia is a New York society girl, who appears to have moved in the same Manhattan social circles as the presumably older Trudy Campbell (with whom she gets along well). In season four, Cosgrove refuses to use Ed's connections to procure new clients for Sterling Cooper Draper Pryce, claiming he doesn't want to be like Pete Campbell. He calls Cynthia "his life" and unlike Pete Campbell, does not want to use her or his future father-in-law to get business. In the fifth season premiere, her character is listed during the credits as Cynthia Cosgrove, implying they were married between the fourth and fifth seasons. Cynthia appears as a background character in several episodes of season five. She is very supportive of Ken's work and his side hobby as an author. She and Ken live in Jackson Heights, Queens.
Read more about this topic: List Of Mad Men Characters, Other Characters