Since 2006, Kemp has received international recognition as an investigative journalist for his critically acclaimed and award-winning documentary series Ross Kemp on Gangs. He was in a film called Playing Away in 1986 in a minor role alongside Neil Morrissey. His most famous role to date is that of hardman Grant Mitchell in the BBC soap opera EastEnders. His first comeback lasted just a few weeks in 2005, but he returned for a period of three months in 2006, before departing once again in June that year. in December 2008, Barbara Windsor, Kemp’s onscreen mother Peggy publicly called for Kemp to return to the role of Grant.
His most famous role to date is that of hardman Grant Mitchell in the BBC soap opera EastEnders. Kemp refused to rule out an eventual return to EastEnders, and various media reports over the next few years speculated that he would be returning to the series. It was co-star Barbara Windsor who convinced him to go back for a brief period. He was treated at the scene by paramedics before being taken to Barnet Hospital in north London, but made a full recovery.