Bill started writing music by age 5 after being introduced to Bill Haley & The Comets and receiving a keyboard from his parents. As a teenager he acquired a guitar and joined various metal bands. He credits Metallica as one of his earliest influences, and later saw parallels between metal and electronic music.
His first exposure to electronic music occurred at 18 when a friend took him to a psytrance show (known as a doof) on a beach in NSW, Australia. At the time, he thought the CDJs were playing everything live and was amazed that someone could do so much complex production on the spot. His foray into electronic music production began shortly after when his parents bought a Macintosh computer. Starting with Garage Band, Day quickly found Ableton, which he still uses today. He received a bachelor's degree in Audio Engineering from SAE Institute in Sydney, NSW, which helped solidify his electronic production skills. Production appealed to Bill because of the frustration of having to work around other musicians in bands, a sentiment echoed by Frank Zappa.
In 2008, Mr. Bill released his first album, Cell Abrasions, through Qwerty Records.
Through the years, Bill collaborated with many artists and released dozens of remixes and singles, as well as 10 EPs. In 2013, he released The Collaborative Endeavours, a double-album consisting of collaborations with various artists over 28 tracks. His fifth album, IRL, was released in 2014, followed 9 months later by his sixth album, Settling for Mediocrity. Both were released through Section Z Records.
IRL was produced during a period of brief hiatus from live shows. Bill became disillusioned with self-management and decided to stop touring and devote his time to writing music. In response to the public statement, Muz Moeller, who manages Opiuo and Tom Cosm, offered to take up the role as manager.
He has an ongoing project, The Art of Mr. Bill, which includes both music and video. As of July, 2015, there are three "seasons," but it will continue to grow as time goes on.