[13] He was educated at the fee-paying Nottingham High School,[14] and then moved on to study economics at the University of Warwick in Coventry, England.

Arun didn't find this very interesting, and often finished his jobs "really quickly", so would write down ideas for YouTube videos that he would record in the evenings.

[15] In 2015, Arun uploaded his first viral video which was a tutorial on creating a makeshift 3D hologram projector by crafting a pyramid composed of reflective material and placing it on a smartphone screen.

[20][21] In August 2024, after achieving a goal he set himself of overtaking Apple in YouTube subscribers, Arun, along with Matthew Perks, built a 2.054-metre (6 ft 8.9 in) replica of the iPhone 15 Pro Max, which, on 29 August, achieved a Guinness World Record for the largest smartphone replica.

[22][23] In 2024, Mrwhosetheboss uploaded a series on his YouTube channel showcasing the features of his newly purchased tech-enabled home.