Campbell, who worked as a special adviser in No 10 until September 2011, is now the senior corporate affairs officer at the Business Services Association, a policy and research organisation which represents outsourcing companies, including those involved in health. 
Campbell previously worked in the Conservative Research Department alongside other architects of Cameron's so-called "social Conservatism", including Ed Llewellyn, Steve Hilton, Rachel Whetstone, Catherine Fall, and Ed Vaizey.
Working for Cameron's Conservative opposition, Campbell - described as "the stats man" - was "Always present in the background".
Contact, Resources, Notes
- Department of Information Services, "Parliamentary Information List", accessed 07.09.10
- 24 August 2012 Why senior staff are leaving David Cameron in droves, The Guardian, 23 April 2013, Accessed 8 September 2014
- [ http://www.theguardian.com/politics/2012/nov/23/david-cameron-privatisation-adviser-health-lobbyist David Cameron's former NHS privatisation adviser becomes lobbyist] The Guardian, 23 November 2012, accessed 30 April 2015
- Andrew Gimson, "The political education of David Cameron", The Spectator, 18.11.09, accessed 08.09.10
- Iain Dale, "There is more to the Conservative team than Steve Hilton", The Telegraph, 06.06.08, accessed 08.09.10