A “computer geek” and career software engineer, Johanssen’s coding skills enable the Hermes crew to override NASA controls and perform the Rich Purnell Maneuver without authorization. She likes the Beatles and Agatha Christie novels. Blonde, petite, and conventionally beautiful, Johanssen’s good looks have made her a poster-girl for the Ares missions, earning her many admirers on Earth. Over the course of the mission, she and Beck fall in love.