He's interest in guitar started with his mother listening to all types of music when he was growing up. Adam Gontier stated on the Three Days Grace website, "My mother is a musician, so she's really the one who introduced me to the experience of performing live. She got me singing with jam bands in bars when I was 12 years old. The Seattle music scene really inspired me and my songwriting. Adam is currently on tour with his band Three Days Grace. While on tour he has posted surveys for people to answer with various questions on his MySpace. The cover of the album One-X includes a quote by Adam that states: I'm on the edge and falling off/and I'm sick of feeling numb/Help me believe it's not the real me/Maybe we can turn it around/Cause it's not too late/I'm standing here alone/feeling so stepped on/It wont be long until I'm burning on the inside/I just don't care anymore/And it drags me down/Things are clear/I will not die/We are one. Adam has several tattoos, including a solid black band and the lyrics to "Never Too Late" on his right forearm, and a tribute to his grandmother on his left arm. While he was in Cleveland, Ohio on March 3rd, 2007 he added a tribal head design on his right upper arm. Also in 2005, Gontier went to rehab for an addiction to Oxycontin at the Toronto rehab center CAMH (Centre for Addiction and Mental Health), which is where many of the songs for One-X were written, including "Animal I Have Become", "Over and Over", "Pain" "Riot" and a few more. He is still sober, and a docu-drama about it named "Behind The Pain" was released in 2007. In 2006, Adam was part of the Big Dirty Band project (created by Geddy Lee and Alex Lifeson) on the Trailer Park Boys soundtrack, along with other Canadian rockers including Lee, Lifeson, Care Failure, Jeff Burrows and Ian Thornley.

In 2007 Adam was featured on Apocalyptica's song "I Don't Care".

He married his high-school sweetheart, Naomi Faith Brewer, in 2005. And To Tell The Truth I THINK HE'S HOT!!!!!!