Susannah Harker (born 26 April 1965) is an English film, television, and theatre actor. She was nominated for a BAFTA TV Award in 1990 for h…Susannah Harker (born 26 April 1965) is an English film, television, and theatre actor. She was nominated for a BAFTA TV Award in 1990 for her role as Mattie Storin in House of Cards.The daughter of actress Polly Adams and actor Richard Owens, she is the sister of fellow actress Caroline Harker.