Joseph Ellis-Stevenson (19 October 1988–8 March 2026), known by various stage names over his lifetime including Young Dot, Dot Rotten, Zeph Ellis, SuperGrxme, Rottimeus.Grxme and Who’s British, was a producer and MC from South London.

He started his career as Young Dot (a reference to K Dot Kidman from Essentials Crew) and released a mixtape called This Is The Beginning and a grime instrumental called “Bazooka” to become a heavyweight in the scene. Ellis later changed his name yet another time to Dot Rotten, confirming this with R.I.P Young Dot—a classic mixtape.

Dot signed to major label Mercury Records for his 2013 debut album, Voices In My Head, and it earned him his first UK top 20 single with the Robert Miles-sampling “Overload”, a song about inner struggles.

As a producer under the name Zeph Ellis, he worked with a lot of people in the scene, with his beats and instrumentals used by a barrage of MCs including Nines, Kano, MoStack, Harlem Spartans, and even Birdman. A generous sport in terms of beats, Ellis released multiple series of free beat tapes including Rotten Riddims Volume 1-7 as Dot Rotten and This Side of Grime Volume 1-5 as Zeph Ellis.

In 2023, Dot adopted a new persona using the names Rottimeus.D.Gruffy (for his MC'ing) and Rottimeus Grxme (for his production). He briefly used the moniker Who’s British in early 2026 following a hiatus he spent as a businessman in Gambia, but was reported as having died just a week after releasing the new single “Psalms for Praize”.