Graham Hook became chief lobbyist at the Investment Association in June 2017.
Hook previously served as a special adviser to the Chancellor of the Exchequer and former foreign secretary Philip Hammond since 2012.  Hammond kept hold of both Hook and special adviser Hayden Allan during his transition from the Foreign and Commonwealth Office to the Treasury in 2016. 
According to PR Week in October 2011:
- Hook moved to Interel after the 2010 general election, having been an assistant director in the Conservative Party's research department.
- At Conservative HQ, Hook managed the ‘briefing team’, responsible for briefing David Cameron and members of the shadow cabinet for high-profile media appearances.
- It is understood he will primarily advise Greening on policy. He is expected to take up the post immediately. 
In 2015 Hook was paid an annual salary of £70,000. for his special adviser role. 
-  accessed Sept 2014
- David Singleton, Lobbyists line up for Tory spad jobs, PublicAffairs, 31 August 2016, accessed 2 December 2016.
- David Singleton Transport Secretary Justine Greening hires Interel consultant as special adviser, prweek.com, 24 October 2011
- APPC Register Entry for 1 June 2011 to 31 August 2011, acc 24 October 2011
- Special advisers in post, 30 November 2014 GOV.UK, accessed 29 April 2015