Gillian G. Gaar is a Seattle-based author. Her first book, She's A Rebel: The History of Women in Rock & Roll was published in 1992. In addition to her own books, she has appeared in various anthologies, including The Nirvana Companion, Trouble Girls: The Rolling Stone Guide to Women in Rock, Nirvana: The Complete Illustrated History, Leonard Cohen on Leonard Cohen: Interviews and Encounters, Goldmine: The Beatles Digest (volumes one and two), The Best of the Beatles Book, The Stranger Guide To Seattle, Music: The Little Black Book, 33 1/3 Greatest Hits Vol 2, A Survey of American Culture, and various editions of The Scribner Encyclopedia of American Lives. She was editorial assistant for Krist Novoselic's book From Grunge To Government: Let's Fix This Broken Democracy!
She was also a project consultant/liner note writer for Nirvana's box set “With The Lights Out.” She has written for numerous magazines, including Rolling Stone, Mojo, Q, Goldmine, The Seattle Times, The Stranger, Option, and No Depression, and was a senior editor at Seattle music paper The Rocket.