Mariette previously held various posts at the Legal Ombudsman Service (LeO) such as Interim Chief Ombudsman, Director of Operations and Ombudsman from 2016 to 2020. The LeO are responsible for the resolution of disputes between consumers and legal service providers in line with the Legal Services Act.
Mariette was also Head of Impact, Service Policy and External Affairs, which was responsible for identifying and learning business processes and driving changes to improve efficiency. Prior to this, Mariette was an investigator from 2014 until 2016.
Mariette has a keen interest in American Football and has represented Great Britain. She currently plays for Birmingham Lions.