Joji

George Kusunoki Miller was born in Osaka, Japan to an Australian father and a Japanese mother. He attended Canadian Academy, an international school in Kobe, Japan, where he graduated in 2012. At age 18, he left Japan and travelled to the United States. On 23 September, 2006, Miller would create his first YouTube channel called "2cool4u92". The channel's only video, which shared a name with the channel, was uploaded on 17 October 2006. In the video, which was recorded by someone who is presumably a schoolmate of his, a 13-year-old Miller breakdances in what is seemingly a school hallway. This is the earliest known video of Miller on YouTube. On 16 June, 2008, Miller created the DizastaMusic channel, on which he generally uploaded sketch comedy-based videos. The earliest known video on the channel was uploaded on 19 June 2008, titled "Lil Jon falls off a table".

The channel began gaining popularity after his conceptualization of Filthy Frank in 2011, a character Miller described as the anti-vlogger of YouTube. The DizastaMusic channel has over 1 million subscribers and 177 million views as of October 2021. On 15 August 2014, Miller uploaded a video to the DizastaMusic channel announcing that he would not be posting any more content onto the channel due to its risk of being lost because of the numerous copyright and community strikes it had received. He also announced that future "Filthy Frank" content would be uploaded to a new channel he had created called TVFilthyFrank.

Miller's channel TVFilthyFrank had many different series, such as "Food" (和食ラップ), "Japanese 101", "Wild Games" and "Loser Reads Hater Comments". This channel currently has a total of 7.88 million subscribers and over one billion views as of October 2023. Miller created a third channel, TooDamnFilthy, on 1 July 2014. On this channel he had two series, "Japanese 101", which was also featured on his main channel, and "Cringe of the Week", which typically was abbreviated to "COTW". As of October 2021, TooDamnFilthy has 2.33 million subscribers and 332 million views.

On 27 September 2017, Miller announced the release of his first book, titled Francis of the Filth, which addresses things uncovered in The Filthy Frank Show and serves as a culmination of the series.

On 29 December 2017, Miller released a statement on Twitter explaining that he had stopped producing Filthy Frank content due to both "serious health conditions" and his lack of interest in continuing the show. In September 2018, Miller stated in a BBC Radio 1 interview that he had no choice but to stop producing comedy due to his health condition.