Not just a party animal but a party guerrilla, Andrew W.K. burst onto the scene with a maximalist hybrid of rock, metal, and pop that celebrated and exaggerated the most bombastic and brazen aspects of all three styles. The California-born, Michigan-bred W.K. — the initials stand for everything from "White Killer" to "Women Kum" to "Wilkes-Krier," the surnames of his mom and dad — began classical piano lessons at age four and moved on to playing in dozens of Detroit punk, noise, and metal bands. By age 17, W.K. was recording his own material. After moving to New York City a year later, his friends passed his demos on to various labels, including Bulb, who released W.K.'s debut EP, Girls Own Juice, in early 2000 and that fall's Party Til You Puke EP. The buzz around W.K.'s hedonistic, so-dumb-it's-smart rawk resulted in album deals with Island/Def Jam in the U.S. and Mercury in the U.K.; his first major-label release was 2001's anthemic Party Hard EP.
In particular, the U.K. fell in love with W.K.'s bloody nose image and deceptively simple sound, inspiring critical raves from NME and Kerrang! as well as hysteria at his live shows; he was hospitalized after a fan head-butted him as he crowd-surfed at his London debut at the Highbury Garage. The full-length I Get Wet arrived in late 2001 in the U.K. and in spring 2002 in the U.S., where cuts from the album began to appear in TV commercials, and the hype lead to a performance on Saturday Night Live. Andrew W.K. also toured extensively that spring, both on his own and as part of an MTV 2 package tour. He returned in 2003 with The Wolf, a bigger, lusher album than his debut that earned mixed reviews. The following year, W.K. hosted an advice show on MTV 2, Your Friend, Andrew W.K. He also maintained his busy tour schedule, and released the concert film Who Knows? in early 2006. Andrew W.K.'s third album, Close Calls with Brick Walls, was released in Japan and South Korea that summer, and was issued in the U.S. as a vinyl-only album by Load Records in 2007. That summer, he also appeared as a guest star on Kathy Griffin's television show My Life on the D List. That year, he also produced the Lee "Scratch" Perry album Repentance.
Andrew W.K.'s career only became more eclectic as the 2000s drew to a close. In 2008 alone, W.K. co-founded a Manhattan nightclub, Santo's Party House; toured with the Calder String Quartet; and released a collection of J-pop cover songs, and I Will Change Your Life, an anthology of his advice columns for Japanese music magazine Rockin' On. He also became a member of the group Current 93, contributing bass, piano, guitar, and vocals to their 2009 album, Aleph at Hallucinatory Mountain and performing on the band's tour that spring. Around that time, W.K. released Damn! The Mixtape, Vol. 1 and his Cartoon Network live-action demolition show Destroy Build Destroy premiered. He also became a frequent guest on other TV shows, appearing on Conan O'Brien, MSNBC, Fox News, and multiple VH1 series.
In late summer 2009, his album of "spontaneous solo piano improvisations," 55 Cadillac, was released on Ecstatic Peace and the Skyscraper Music Maker labels, the latter of which also planned to give Close Calls with Brick Walls a U.S. release on CD. Around that time, W.K. also released Gundam Rock in Japan, which featured his versions of the music to the classic anime Gundam to commemorate the series' 30th anniversary. Close Calls with Brick Walls finally appeared on CD in wide release in 2010 as a set with Mother of Mankind, a disc of rarities and previously unreleased tracks.
The following year, W.K. released a Japan-only EP, Party All Goddamn Night, which featured a mix of new and previously released material; in 2012, he celebrated the tenth anniversary of I Get Wet with a Deluxe Edition featuring an extra volume of live and unreleased songs. After writing a weekly advice column for the Village Voice, hosting a weekly self-improvement radio show for The Blaze network, and embarking on a lengthy 2016 speaking tour titled The Power of Partying, he returned to the business of recording music, issuing a pair of singles, "Music Is Worth Living For" and "Ever Again," in advance of his fifth studio album. In March 2018, Sony released You're Not Alone, and W.K. took his band on a world tour that lasted through the final days of 2019.