Vocalist/musician for Bikini Kill, Le Tigre, and The Fakes; activist, and zine writer.
In 1998, Hanna released a solo album under the name Julie Ruin.
Hanna has contributed a great deal to the revival of feminism and is considered one of the leading icons of the '90s riot grrrl movement. She has collaborated with a wide variety of musicians, appearing on records with numerous artists, such as Atari Teenage Riot, Joan Jett, the Rickets, Green Day, Internal/External and Mike Watt.
Married to Adam Horovitz (Beastie Boys) in 2006.