On 1st of October 1984, Weaver got married to Jim Simpson. Jim Simpson is a director and he is also known for being the founder of The Flea Theater. As a married couple, they have welcomed a daughter named Charlotte Simpson. Her nationality is American and she has mixed European ethnicity. She has a towering height.
As a child, Weaver was enrolled at Ethel Walker School. Later on she got enrolled at The Chapin School and The Brearley School. After her high school graduation, she joined Sarah Lawrence College and then she got transferred to Stanford University. In the early 1970s, she attended Yale University School of Drama with a major in fine arts and she finally earned her Master of Fine Arts degree from there in 1974. While she was in Yale University, she appeared in several plays and theater shows. There she performed in the play The Frogs. She made her TV debut in 1976 by starring the role of Avis Ryan in an American television soap opera Somerset. Next year she played the role of Laura Wheeler in the miniseries The Best of Families. She made her feature film debut in 1977 by portraying the role of Alvy's Date Outside Theatre in an American romantic comedy film Annie Hall. For this role, she earned the salary of $50 in 1977. She got her rise in fame at the end of 1970s after she portrayed the role of Ripley in a British-American science-fiction horror film Alien. She is also critically acclaimed for starring the role of Dana Barrett in movies like Ghostbusters and Ghostbusters II. She is now aged 66 years old. Her net worth is $40 million.