Garrett studied video production at university and initially intended to be a games journalist. His early YouTube work consisted of "" videos which he made for his own amusement. When he noticed that his primary audience was children, he reoriented his work to be family-friendly.When the videos became popular, Garrett left his job as a barman to focus on producing the content full-time.
Garrett's YouTube channel is aimed at children, and his audience is largely 6 to 14-year-olds. As the character of Stampy Cat, an orange and white cat, Garrett tells stories within Mine craft and other games. He gives viewers ideas for activities to pursue with their friends.