Before being elected to this seat, he started his legal career prosecuting criminal cases in the Middlesex County District Attorney's Office.

In this capacity, Driscoll led the Sexual Assault and Child Abuse Unit where he was responsible for trying such cases and working with key witnesses, including children.

Driscoll was then appointed Assistant Attorney General assigned to the Medicaid Fraud Control Unit, a division dedicated to protecting the elderly from fraud and abuse.

He handled high profile Superior Court cases including attempted murder, armed robbery, domestic violence and child abuse cases.

[1] After a campaign for Norfolk County District Attorney, his term ended in January 2011 and he was succeeded by Mark Cusack also of Braintree.