Has directed only three feature films, the last two of which have resulted in three of her actors receiving Oscar nominations: Melissa McCarthy, Richard E. Grant, and Tom Hanks.
Has a son, Wylie Red Heller Taccone (b. December 12, 2014), with her husband Jorma Taccone.
Her younger brother Nate Heller has composed the music for all three films Marielle has directed.
Member of the 'Academy of Motion Picture Arts and Sciences' (AMPAS) since 2016.
Marielle Heller wanted to have a full frontal shot of the lead actress in "The Diary Of A Teenage Girl" but the actress didn't want to, possibly because of her comfort level.