Rupert Grint made his big-screen debut in 2001's box-office smash Harry Potter and the Sorcerer's Stone, bringing to life Ronald Weasley, friend to the famous protagonist Harry Potter of J.K. Rowling's children's novel. Born in England in 1988, Grint had only performed in plays for school and local theater in Europe before making the giant leap into Hollywood with Harry Potter. He scored a role in the family comedy Thunderpants soon afterward, but was kept busy for the next several years as audiences saw him grow up alongside co-stars Daniel Radcliffe and Emma Watson while appearing in the ongoing Harry Potter sequels. He emerged in 2006 with a starring role in the well-received comedy drama Driving Lessons, alongside Hollywood heavyweights Julie Walters and Laura Linney. Though he appeared in the 2009 films Cherrybomb and Wild Target, he was still most well known as Harry Potter's best friend. The series came to a close in 2011.
Composed and performed a hip-hop song on his audition tape for Harry Potter and the Sorcerer's Stone.
Harry Potter and the Prisoner of Azkaban director Alfonso Cuaron asked the cast to write essays about their characters in order to prepare for the movie; Grint didn't write his, stating that that's what Ron Weasley would have done.
Starred in the 2006 coming-of-age film Driving Lessons with Julie Walters, who played his mother in the Harry Potter films.