Chapman began posting videos on his YouTube channel in 2010 and released his first book, titled 147 Things, on 5 October 2017.

Chapman graduated from the University of East Anglia with a Bachelor of Science in Psychology, he planned to do a master's degree, but decided not to continue in order to pursue his online career.

[6][9] Chapman has done a number of collaborations on his channel with other YouTubers, including: Marcus Butler, Alfie Deyes, Louise Pentland, Grace Helbig, Tyler Oakley, Zoe Sugg, Joe Sugg, Louis Cole, Caspar Lee and many others.

On 28 March 2022, Chapman and Tarleton were officially married at the Santa Barbara courthouse in California.

In early September of 2022, they held a wedding ceremony at Villa Luisa in Seville, Spain, attended by family and friends.