David Knott makes the switch to lobbying after five years with the House of Commons Scrutiny Unit.
The scrutiny unit was set up under Tony Blair in November 2002. It supports departmental select committees in scrutinising draft bills and is also responsible for co-ordinating evidence-taking sessions of public bill committees.
Knott has specialised in financial scrutiny for select committee inquiries and will focus on financial clients at Fleishman-Hillard.
Before working in Parliament, Knott was an economist at the Fuji Research Institute Corporation.