Melinda Wrenn Schmidt (born February 18, 1983) is an American actress. She is best known for her starring role as NASA engineer, flight director, and later director of NASA Margo Madison in the Apple TV+ original science-fiction space drama series For All Mankind. Her other television roles include Julia Sagorsky in the period drama series Boardwalk Empire (2012–2013), KGB handler Kate in the spy drama series The Americans (2014), Dr Iris Campbell on the thriller series Person of Interest (2014– ...