He previously was chief of staff and speechwriter to May when she was secretary of state for the Home Office and minister for women and equality , and served in her team from 2010 to 2015 general election. 
Timothy is described as 'fiercely loyal', 'not popular in the Home Office' and as 'rabid and an attack dog'.
Home Office's most senior aide blocked from running in safe seat
It was reported that Timothy had applied to run in the May 2015 election as prospective parliamentary candidate for the Conservative safe seat of Aldridge-Brownhills,  but had his name, unbeknown to him, removed from the candidate list. The Public Administration Committee reported on the incident, concluding that it is unacceptable for ministers or civil servants to be “complicit” in the matter, and that the special advisers in question should not have been refused the ruling they asked for. 
Following the incident, the Conservative Party apologised to Timothy for not reinstating him on to the list. 
Timothy was previously deputy director of the Conservative Research Department and responsible for much of its day-to-day running.  Nick managed a team of up to 20 policy advisers. He oversaw the production of policy papers, briefing notes, rebuttals and media strategies (e.g. for the general election TV debates, the launch of rival parties’ manifestos and the Queen’s Speech); contributed to the 2010 general election manifesto and edited the 2010 edition of the ‘Campaign Guide’; and was a member of David Cameron’s PMQs team and the Party’s by-elections team. 
He was also a directory of the charity New Schools Network - which promotes and helps set up free schools - from 2015 until he took up his role in No.10 in July 2016 . The first director of New Schools Network, Rachel Wolf, had also taken up a role at No 10 as David Cameron’s education adviser. The second – Natalie Evans – is a Conservative whip in the Lords. SchoolsWeek even called the charity 'part of a revolving door'. 
Earlier in his career he worked in the insurance industry.
Away from the day-job he acts as a volunteer mentor to sixth-form students, who hope to study at university, for the Social Mobility Foundation from under-privileged families. 
For his special adviser role to May in the Home Office, Timothy was paid an annual salary of £74,000.
Nick graduated with a first class degree in Politics from the University of Sheffield in 2001.
Contact, Resources, Notes
- Rowena Mason, May appoints former advisers as joint chiefs of staff, The Guardian, 15 July 2016, accessed 8 December 2016.
- Department of Information Services, "Parliamentary Information List", accessed 7 September 2010.
- Mark Wallace Exclusive: The longlist to succeed Hague in Richmond Conservative Home, 1 October 2014, accessed 16 October 2014.
- Paul Goodman Game of SpAds latest. Home Office – Nick Timothy leaves, Alex Dawson arrives, Conservative Home, 24 May 2015, accessed 8 June 2015.
- Sue Cameron Has Theresa May the Mettle for Follow the Iron-Lady The Telegraph, Published 5 Jun 2014, Accessed 18 September 2014
- War as No10 kills off bid by May's allies to be MPs: Home Office's most senior aide blocked from running in safe seat while another adviser is removed from candidates' list Daily Mail Online, 18 December 2014, accessed 13 May 2015
- The Party should apologise to Timothy and Parkinson – and put them both back on the Candidates’ List Conservative Home, 24 March 2015, accessed 13 May 2015
- Open Road, "Cameron's Conservatives: The ones to watch", accessed 12.09.10
- Nick Timothy University of Cambridge, accessed 9 October 2014
- Laura McInerney, Nick Timothy, director New Schools Network, SchoolsWeek, 22 March 2016.
- John Dickens, Nick Timothy leaves New Schools Network for Number 10 role, SchoolsWeek, 13 July 2016. Accessed 08 December 2016.
- Special advisers in post, 30 November 2014 GOV.UK, accessed 29 April 2015.