Rooney Mara is the great-granddaughter of Tim Mara, the founder of the New York Giants football team.
Mara is also the younger sister of actress Kate Mara, who is best known for her roles in "House of Cards" and "American Horror Story."
Mara was initially rejected for the role of Lisbeth Salander in "The Girl with the Dragon Tattoo," but she persevered and eventually won the role.
Mara was a vegetarian for many years before becoming a vegan, which she credits to watching the documentary "Earthlings."
Mara is an accomplished equestrian and has competed in horse shows since she was a child.
Rooney Mara has a degree in psychology from New York University, which she earned while pursuing her acting career.
Mara has a fear of flying and avoids it whenever possible, which sometimes makes it challenging for her to travel for work.
Mara has several tattoos, including one of the letter "A" on her ankle, which she got in honor of her role in "The Girl with the Dragon Tattoo."
Mara is a fan of heavy metal music, and has cited bands like Metallica and Slayer as some of her favorites.
Rooney Mara is a co-founder of the clothing line Hiraeth, which specializes in ethically and sustainably made clothing.