John Stier joined the Group in June 2015 as Chief Financial Officer. He is a fellow of the Institute of Chartered Accountants with a background in corporate finance. John was previously the Chief Financial Officer of Northgate Information Solutions Ltd (NIS) for over ten years. NIS was a FTSE 250 organisation until 2007, when the business was acquired by KKR, the US private equity firm. Prior to this, he was the Chief Financial Officer of Subterra Ltd, a subsidiary of Thames Water Plc which delivered engineering services to businesses across Europe. John is a non-executive Director and Audit Chair at Redburn (Europe) Limited.