Amy Hargreaves. Actress: Homeland. Amy Hargreaves (born January 27, 1970) is an American actress who has worked in film, television and theater. She has a recurring role on Homeland as Maggie Mathison. In 1994, she starred in Brainscan with Edward Furlong. In 2012 she made an appearance as Dr. Karen Folson in the 2nd season episode "Leap of Faith" on the CBS show Blue Bloods. In 2017 she portrayed the...