She starred in the critically-acclaimed 2010 film Greenberg, and appeared in the romantic comedies Arthur and No Strings Attached.
She studied English and philosophy at Barnard College.
She provided the voice of Pony Marks on the Cartoon Network's Adult Swim show, China, IL.
Greta's parents are Christine and Gordon, a financial consultant and computer programmer. In 2011 she began dating director Noah Baumbach.
Her first television appearance was on the Jimmy Kimmel Live! show in 2010.