Campbell is a Consultant to Stephensons' Criminal Appeals team.
Campbell was formerly a Partner at Stephensons prior to his retirement in 2010.
He was admitted to the profession in 1969 and has enjoyed a 40-year career as a criminal lawyer, earning a national reputation as one of the country's leading miscarriage of justice campaigners.
He was acclaimed for his role in the overturning of Stefan Kiszko's life-sentence for murder, 17 years after his imprisonment for a crime it was later proven that he could never have committed.
Campbell ran his own practice in Salford before merging with Stephensons in 1999, and the Appeals team was built around his experience of dealing with serious, complex crime and his national reputation for investigating and challenging miscarriages of justice. The department has achieved a significant number of referrals to the Court of Appeal from the Criminal Appeal Cases Review Commission and in 2005 alone dealt with seven murder or manslaughter appeals including the landmark decision on so-called 'shaken baby syndrome'.
The Appeals work is undertaken alongside the Prison Law team which developed as a result of the appeal work and difficulties commonly faced by those maintaining their innocence.
Campbell is the chair of the Criminal Lawyers Appeal Association, a body he helped set up, and he is frequently asked to lecture on his experiences.
He is also recommended as an expert in the Legal 500, which says he is 'undoubtedly “the elder statesman” of criminal appeals’.
Campbell's cases of note include:
HOUSE OF LORDS
DPP V Luft (1976) 2 ALL ER 569 (regarding responsibility of publisher of material relating to an election)
COURT OF APPEAL


