Maura Lynn Tierney (born February 3, 1965) is an American film and television actress. She is best known for her roles as Lisa Miller on the sitcom NewsRadio (1995–1999), Abby Lockhart on the medical drama ER (1999–2009), and Helen Solloway on the mystery drama The Affair (2014–2019), the last of which won her a Golden Globe Award for Best Supporting Actress – Series, Miniseries or Television Film.
Tierney appeared in numerous films, including Primal Fear (1996), Liar Liar (1997), Primary Colors (1998), Forces of Nature (1999), Insomnia (2002), Semi-Pro (2008), Baby Mama (2008), Beautiful Boy (2018), and The Report (2019).
The eldest of three children, Tierney was born and raised in the Hyde Park neighborhood of Boston, Massachusetts, to an Irish Catholic family. Her mother, Pat (née James), is a real estate broker and her late father, Joseph M. Tierney, was a prominent Boston politician who served on the Boston City Council for 15 years.