[6] After parting ways with Roadrunner following a feud, Glassjaw signed with Warner Bros. Records, who issued the group's second outing Worship and Tribute (2002).

The album reached number 82 on the Billboard 200 chart and brought Glassjaw to mainstream attention, although its supporting tour was negatively affected by Palumbo's struggles with Crohn's disease around this time, leading to the cancellation of several dates.

[7] Although the group continued to tour semi-regularly, Glassjaw's studio activity was sporadic for the rest of the 2000s whilst Palumbo and Beck focused other projects.

A significant recording came in 1999 working with Don Fury (Quicksand, Snapcase, Orange 9mm, The Hearing Aides), showcasing songs that appeared on their debut LP Everything You Ever Wanted to Know About Silence.

'"[13] The line-up on this record was Palumbo, Beck, Todd Weinstock, Manuel Carrero and Sammy Siegler (who left the band prior to the subsequent tour).

[15] The music was aggressive and unrelenting, but also included spacious songs like "When One Eight Becomes Two Zeros", "Her Middle Name is Boom", "Piano" and the epic "Everything You Ever Wanted to Know About Silence", the latter of which deals with Palumbo's problems with Crohn's disease.

Matters were somewhat worsened when Palumbo started to have bouts with his Crohn's disease on tour, as his aggressive performance style sometimes triggers a relapse, which has the potential to be fatal.

[17] In 2001, the band entered the studio in secret with Ross Robinson and began recording their follow-up album Worship and Tribute, which would see release the following year.

This album showcased a more melodic and mature Glassjaw, as they started to further incorporate jazz and ambient influences, particularly in tracks like "Ape Dos Mil", "Must've Run All Day", "The Gillette Cavalcade of Sports", and "Convectuoso" (which did not appear on the official release due to a publishing dispute with Roadrunner).

In October 2002, dates in Germany and the UK were cancelled when Palumbo was hospitalized in Paris after suffering a relapse of the Crohn's; he underwent intestinal surgery.

[23] After a two-year hiatus, the band played three shows in 2005; two at The Downtown in Farmingdale, New York, with proceeds going to charity, and a spot on The Used's tour at the Hammerstein Ballroom.

At the end of 2007, Glassjaw, for the first time, headlined in southern California in various venues such as the Avalon in Hollywood, the House of Blues in San Diego, and the Glasshouse in Pomona.

In an interview with Palumbo in the July 2006 issue of AP magazine, he stated that the band were in the process of writing and recording new material for the next album, which they hoped to release in 2007.

In November 2007, in the first Glassjaw interview in years, Beck revealed they had written "about eleven good songs -- seven [that] I love, and four to six half-baked ideas we need to finish".

[35] Around the same time, Glassjaw parted ways with Warner Bros. Records due to large corporate shakeups in the company, as well as Palumbo's creative differences with the label regarding Head Automatica's still-unreleased third album, Swan Damage.

In August 2010, Glassjaw returned to the UK to headline the Hevy Music Festival held at the Port Lympne Wild Animal Park near Folkestone.

To promote an EP consisting of 5 new songs, Glassjaw presented a unique marketing program where fans were offered a free digital release in conjunction with a special limited product or event.

Shortly thereafter, in addition to the launch of the single, a "one-take" live video of their 2008 song "You Think You're John Fucking Lennon" was posted on the official Glassjaw website.

On December 20, 2010, MerchDirect began selling ticket/poster bundles for Glassjaw shows across the U.S. On New Years Day 2011, the Our Color Green (The Singles) EP was released digitally to online music retailers including iTunes, Amazon, and eMusic among others.

On the weekend of November 28, 2014, the band's merchandise website had a Black Friday sale where fans would get 19.93% off their order if they applied the promo code "weactuallyjuststartedwriting", hinting that a new album was in the works.

A flexi-disc format of the album containing 10 songs was sent to fans who previously had ordered Glassjaw merchandise through Justin Beck's MerchDirect company prior to an official announcement.

Glassjaw have cited numerous bands as influences, including Bad Brains, Sick of It All, Orange 9mm,[11] Faith No More, Anthrax,[59] the Cure, Squeeze,[14] and Fugazi.

And when it’s time to do it, the universe very much lets us know.”[71] Both Palumbo and Beck have been openly vocal about their negative experiences with Roadrunner, and have continued to talk about them years after their departure from the label in December 2001.

[72] They openly advise people not to buy their first full-length so as not to give the label money, and have repeatedly told fans at shows to illegally download the record.

Born of the Long Island hardcore scene, producer Ross Robinson declared in 2000 that Glassjaw "was on a mission to destroy the ‘Adidas Rock’ of nu-metal bands like Limp Bizkit.

"[75] Their usage of dissonant melodies through their two guitarists, Justin Beck and Todd Weinstock, created a jazz-like sound that was unique and original for the genre.

[75] Nick Greer of Sputnikmusic stated that "part of what makes Glassjaw such a stand out band is a combination of structured genre blending and blissfully naive experimentation.

"[76] Michael Ventimiglia of the Long Island Press said that their Worship and Tribute album "helped shape and define music for a new generation.

"[77] Modern post-hardcore bands such as Funeral for a Friend, Night Verses, The Movielife, The Color Morale and Letlive have named Glassjaw as a formidable influence.

[78][79][80][81] Funeral For a Friend lead singer Matt Davies-Kreye stated that "Glassjaw are such an experimental band and integrate a lot of different styles and influences in their music such as ambient rock, hardcore, post-rock and jazz.