Born in Neath, he was brought up in Porthcawl. He started acting while a pupil at Porthcawl Comprehensive School, before he went on to study at LAMDA.
Simons first TV role came soon after graduation in 1993, as oil rig worker Wilf Granelli in Roughnecks. He is known for playing the role of Sergeant Craig Gilmore in the long running ITV drama The Bill. Simons can also be seen in two episodes of Little Britain, where he plays Glynn, a gayvicar featured in scenes about Daffyd Thomas (A homosexual with homophobic tendencies who believes he is the "only gay in the village").