Star of Channel 4's Shameless as the Tourette syndrome-stricken character of Marty Fisher who later began a series regular role in BBC's Father Brown as Inspector Mallory.
He was featured in the soap opera Families in 1990 alongside Jude Law.
He was a guest star in a 1999 episode of Queer As Folk.
He was born Ian Deam in Oldham, Lancashire, England. He chose the name Jack as his stage name in honor of his grandfather.
He would star alongside Emer Kenny in Father Brown.