Matt McJunkins was raised in Palm Springs, California, where he started playing bass guitar at the age of 13. After high school, McJunkins moved to Los Angeles to pursue a music career. He attended the Musicians Institute and honed in on his craft while writing music and playing in several rock bands.
In 2008, Billy Howerdel from A Perfect Circle asked McJunkins to join his side project Ashes Divide, with Jeff Friedl, Andy Gerold and Adam Monroe completing the line-up. The band toured extensively in support of their debut album Keep Telling Myself It's Alright (2008), opening concerts for Seether, Stone Temple Pilots, and Filter, and also performed at the Projekt Revolution festival. McJunkins later toured with Puscifer, sharing bass guitar with Rani Sharone.
In September 2010, A Perfect Circle announced that they would reform and McJunkins was asked to join on bass alongside co-founders Billy Howerdel and Maynard James Keenan with Jeff Friedl and James Iha. In the following years, McJunkins formed The Beta Machine with Jeff Friedl and toured with Thirty Seconds to Mars in 2011. In January 2020, he announced he was touring with singer Poppy in support of her album I Disagree.

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