Matt Heafy

In October 2019, Heafy was a featured guest-vocalist on an acoustic version of Stabbing In The Dark by Ice Nine Kills.

In 2016, Heafy appeared on Arktis by fellow musician Ihsahn.

Heafy does not know formal music theory and was almost completely self-taught. He does know how to read sheet music, but can only apply it on the saxophone. However, in 2015, he started taking formal training for the guitar.

In 2015 Heafy contributed to the metal supergroup album Metal Allegiance. He provided lead vocals and additional guitars on the track "Destination: Nowhere". He also contributed on guitar for the track "Triangulum I. Creation II. Evolution III. Destruction".

Heafy, following his guitar performance at the school's talent show, was asked to try out for Trivium by the band's original singer Brad Lewter. Originally, he was accepted as lead guitarist, despite being only 12 years old (other members were 15-16 at that time). Lewter, however, quit the band in less than a month due to creative differences over the band's future musical direction. The drummer Travis Smith persuaded Heafy to do vocals, even though Heafy himself was unsure of his singing voice at that time. The band started looking for an external singer to fill in the position but had trouble finding a suitable candidate. Eventually, Heafy agreed to become a full-time lead singer for Trivium also keeping the position of lead guitarist for the band. He taught himself growling and screaming, especially doing so during the band's early years. However, he admitted using the techniques incorrectly most of his career, which ultimately caused severe damage to his vocal chords in the years leading up to the band's performance at Rock on the Range in 2014, where he blew his voice on stage. That same year, he started taking vocal lessons from coach Ron Anderson following advice from M. Shadows of Avenged Sevenfold. In 2016, Heafy returned to performing unclean vocals live with the same frequency as he did before his injury, citing Anderson's lessons as a source of help and improvement. He claims that the new technique is actually easier than normal talking.

In 2014 Heafy contributed to DragonForce's sixth studio album titled Maximum Overload. He performed backing vocals in three of the album's ten tracks: "The Game", "Defenders" and "No More".

In 2013, Epiphone released his artist signature model Les Paul in both 6 and 7 string versions. He had previously been seen playing his signature models on the Dream Theater "A Dramatic Turn of Events Tour". In 2017, Epiphone released a new signature model called "SnØfall", which drew inspiration from Trivium's 2015 album Silence in the Snow. This model is available in 6 and 7 string configurations and features an exclusive custom Alpine White finish along with white Phenolic fret board.

With the release of Trivium's 4th album, Shogun, Heafy greatly expanded his vocal range; from very melodic singing to hardcore screams. In 2011 Trivium's fifth studio album In Waves was released with a 'greater emphasis on songs rather than skill,' with the album featuring the full range of Heafy's vocal talents with some songs being entirely composed of screaming and others with no screaming at all, and many songs that fused the two as with previous records.

On January 10, 2010, Heafy married Ashley Howard in Orlando, Florida. The wedding was attended by their close friends and family. The couple have two twin children, a daughter, Mia Kiyomi Heafy, and a son, Akira Hiro Heafy, both born on November 6, 2018. Matt returned home from tour to be with Ashley while she gave birth while the tour finished with Howard Jones and Johannes Eckerström performing guest vocals on various songs and YouTuber Jared Dines filling in on guitar.

Heafy has been endorsing Gibson since Summer 2009, but before he endorsed Dean after he and Corey Beaulieu were both given Dean Razorback prototypes in 2006. In 2008 his signature model, an ML shape with a graphic of the Japanese Rising Sun, was released. He stopped using Deans in 2009 after some disagreements. In summer 2009 Gibson made him a custom 7 string Explorer, which later became a production model but only available in black right-handed models.

Heafy—along with several other metal artists—makes guest appearances in the music videos for "Aesthetics of Hate" by Machine Head, released March 27, 2007, "All I Want" by A Day to Remember, released January 7, 2011, and "Moving On" by Asking Alexandria, released September 12, 2014.

Heafy won the Metal Hammer "Golden God" award in 2006.

Also in 2006, he sang one song, "Blind", for Korn at the Download Festival when Korn's lead vocalist Jonathan Davis fell ill.

In 2005, Roadrunner Records released Roadrunner United: The All-Star Sessions to celebrate the label's 25th anniversary. Four "team captains" were chosen: Joey Jordison (Slipknot, Murderdolls, Scar the Martyr), Robb Flynn (Machine Head), and Dino Cazares (Fear Factory) as well as Heafy. Heafy also wrote the lyrics and sang the lead vocals to "The End," captained by Dino Cazares. He and bandmate/guitarist Corey Beaulieu recorded the song "In the Fire" as well, featuring singer King Diamond, bassist Mike D'Antonio, and drummer Dave Chavarri. He also wrote and played guitar on the tracks "Dawn of a Golden Age", "I Don't Wanna Be (A Superhero)" and "Blood and Flames," also contributing vocals to the latter.

Heafy was born in Iwakuni, Japan to a Japanese mother and an American father. His father, formerly a member of the United States Marine Corps, is half Irish and half German. Although Heafy was born in Japan, and is Japanese, he only lived there for one year and does not speak Japanese fluently; however, he uses some basic phrases when he performs in Japan. His family then moved to Orlando, Florida, where he currently resides. Heafy attended Lake Brantley High School. He completed his senior year while also touring in Europe, and graduated in 2004. During those years, Heafy used to live a straight edge lifestyle. Heafy also has a younger sister who does covers of video game music on her YouTube channel.

Matthew Kiichi Heafy (born January 26, 1986) is a Japanese-born American musician best known as the guitarist and lead vocalist for the American heavy metal band Trivium. Heafy is also the lead vocalist for the band Capharnaum, along with Trivium's former producer Jason Suecof. He is also a gamer and practitioner of Brazilian Jiu-Jitsu, and he does daily live streams on his Twitch channel "matthewkheafy", which consist of playing video games, running guitar clinics, vocal warm ups, showcasing his Brazilian jiu-jitsu classes, and playing Trivium songs and acoustic covers.