[4] With Brand New, Lacey earned a number-one album in the United States due to the commercial success of 2017's Science Fiction.

[6] Lacey has produced and co-produced a number of records, including those Brand New, as well as Kevin Devine's Bubblegum and a track by Cymbals Eat Guitars.

[10] Albums by Billy Joel, "Weird Al" Yankovic and The Big Picture by Michael W. Smith were amongst some of the first that Lacey owned.

[12] After Nolan convinced Lacey to learn the bass guitar, the two friends would go on to form a number of bands during their high school years, one of which was named Gudmunder Bjornsen.

[14] In 1998, Lacey, along with Garrett Tierney, Brian Lane and Brandon Reilly formed the Rookie Lot, who would self-release a split EP as well as a demo tape.

He contributed bass guitar and backing vocals to their first EP in 2001, but left the band during the recording sessions after Nolan slept with Lacey's girlfriend.

[20] After finishing the extensive touring and promotional cycle for their album Deja Entendu, Lacey had become unsure as to whether he even wanted to release another record.

In an interview, Lacey stated that he had the realization that he no longer wished to be associated with many of the people and bands he'd met over the past years with Brand New, and he also felt as though he had no friends.

[21] After the loss of a number of his friends and family members, Lacey and his bandmates purposely immersed themselves in their grief, channeling it into the songwriting with the hope of expelling it.

[6] In later interviews, Lacey stated that the writing and recording of their third album, the critically acclaimed The Devil and God Are Raging Inside Me, saved the band.

[24] One of Lacey's first solo shows was on April 27, 2004, at The Downtown in Farmingdale, New York, performing a mixture of covers and songs by his band, Brand New.

[31][32] At various Brand New shows in 2014 and 2015, Lacey joined support band Dinosaur Pile-Up on stage, performing their track "Nature Nurture".

[34] In 2015, Lacey, along with Mike Sapone, co-produced the track "Aerobed" for the band Cymbals Eat Guitars, as part of the Devinyl Splits series, curated by Kevin Devine.

[8] American singer Halsey, a publicized Brand New fan, referred to Lacey as "largely responsible for why I write with such detail.

"[35] Lacey and the rest of the band earned songwriting credits on Halsey's 2020 album Manic as a result of her sampling the "(Fork and Knife)" demo on her song "Alanis' Interlude".

Early on in his career as a musician, Lacey cited bands such as Lifetime, Foo Fighters, the Cars and Pearl Jam as influences for himself and Brand New.

[16] He later taped the words "Hi Moz", a reference to the Smiths frontman Morrissey, to his guitar during their performance of "The Quiet Things That No One Ever Knows" on Jimmy Kimmel Live!

[38] Towards the release of The Devil and God Are Raging Inside Me, Lacey expressed his fandom of the Stone Roses and Ride.

[40] Religious imagery and themes such as faith, the afterlife, the supernatural as well as moral issues are often explored in Lacey's songwriting.

[44] During the sessions, Lacey and Devine's friendship would play a major influence on his songwriting, with him looking to write more about current events.

[56] Prior to forming Brand New, Lacey attended Nassau Community College on Long Island for three years, studying child psychology and elementary education.