Joseph William Quinn Walker is an Australian musician, singer, and producer who is best known as being the lead guitarist for the band King Gizzard & the Lizard Wizard. Walker was previously part of the electronic duo Trumpdisco and indie rock band Love Migrate. He also releases solo works under the name Bullant.

King Gizzard & the Lizard Wizard (KGLW) are an Australian rock band formed in 2010 in Melbourne, Victoria. The band's current lineup consists of Stu Mackenzie, Ambrose Kenny-Smith, Cook Craig, Joey Walker, Lucas Harwood, and Michael Cavanagh. They are known for exploring multiple genres, staging energetic live shows, and building a prolific discography.