Sigourney Weaver (born Susan Alexandra Weaver ) is a actress best
known for her role of Ellen Ripley in the four Alien films. Other films with
Weaver include Ghostbusters (1984) and its sequel Ghostbusters ll
(1989) Gorillas in the Mist: The Story of Dian Fossey (1988), and
Working Girl (1988). Her most  recent work was in James Cameron’s
Avatar (2009). Weaver has received three Academy Award nominations
and six Golden Globe Award nominations, two in 1988 (Best Actress
and Best Supporting Actress) for Gorillas in the Mist and Working Girl.

Sigourney Weaver with Bill Murray and Dan Aykroyd from
Ghostbusters