Mitch Harris was the guitarist, bassist and vocalist while Mick Harris was the drummer and vocalist as well, until Mick left the group shortly after their first album Purity Dilution was released.
[1] Before Defecation started, Mick was the drummer for Napalm Death, and Mitch was the guitarist for Righteous Pigs.
They formed Defecation in 1987 and released Purity Dilution on Nuclear Blast Records in 1989.
[2] Shortly after the release of Purity Dilution, Mick left the band, as well as Napalm Death in 1991.
Mitch Harris and Jesse Pintado joined Napalm Death, and Defecation was put on hold for a while.