1. He has appeared in numerous film and television dramas and is perhaps best known for roles in Lock, Stock i porachunki, The Land Girls and Luther.
2. Mackintosh was born in Cambridge, Cambridgeshire, the son of Dorothy Parris and Malcolm Mackintosh. Sawston Village College and Dramawise Theatre School.
3. He made his stage debut aged 12 at the Bush Theatre, London and then landed the lead role in the National Theatre production of Brighton Beach Memoirs.
4. Mackintosh played Ivan Lewis in the big screen version of The Sweeney.
5. He played Jack in Set Fire to the Stars with Elijah Wood and worked with Michael Caton Jones for the second time on his film Urban Hymn.
6. Steven plays DS Winter in the 10 part series Lucky Man, created by Stan Lee for Carnival films and Sky TV. He played Robbo in From There to Here by BAFTA winning writer Peter Bowker for the BBC and played John Coniston in the acclaimed Inside Men for BBC 1.
7. His other numerous credits include: Luther, Lost Christmas, The Other Boleyn Girl, The Buddha of Suburbia, Prime Suspect and Our Mutual Friend.
8. Mackintosh won Best Actor at the Royal Television Society Awards and a Best Actor Nomination at the BAFTAs for his role in Care for the BBC.
9. In recent years Steven has become a popular choice to narrate documentaries and he replaced Jamie Theakston to narrate the BBC police documentary, Traffic Cops.
10. He is married to the actress Lisa Jacobs and they have two daughters, Martha Mackintosh and Blythe Mackintosh.