He is best known as the lead vocalist, rhythm guitarist and primary songwriter for the American rock band All Time Low since its formation in 2003.

He spent his childhood in Toot Hill until the age of six, when his father's employment led them to emigrate to the United States.

[citation needed] Gaskarth started playing music with bandmate Jack Barakat in eighth grade.

[4] They signed to Emerald Moon Records in 2004 while still in high school and released their debut EP, "The Three Words to Remember in Dealing with the End".

[12] In 2017, the band released a new song entitled "Dirty Laundry" and also reveals that they had left Hopeless Records and has signed with Fueled by Ramen one year prior.

[citation needed] In 2023, on Valentine's Day, the band released a song ‘Modern Love,’ a new anti-dating anthem from their upcoming album, Tell Me I'm Alive.

[21] On 24 January 2019, Gaskarth announced he was forming a new group with Mark Hoppus of Blink-182 called Simple Creatures.

He stated in a Reddit AMA that he abandoned the instruments due to difficulties replacing parts while overseas.

[25] All Time Low Simple Creatures If You Could Only Keep Me Alive Skip School, Start Fights Triple Crown Come Around Epitaph Drive-Thru 2011 Get Your Heart On!