Joanna Penn is a special adviser to Theresa May and Number 10's deputy chief of staff, appointed in September 2016.  In this role, Penn supports May's closest aides, Fiona Hill and Nick Timothy, in ensuring the prime minister's priorities are delivered across government. 
As of December 2016, her annual salary is £100,000. 
Penn worked in the Conservative Research Department alongside Hill and Timothy, specialising in work and pensions policy research. She was then appointed as policy adviser to May in the home office.
Penn studied at the Kennedy School of Government at Harvard. 
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- Andrew Smith, Who is who in Theresa May’s Downing Street], Weber Shandwick, 30 September 2016, accessed 12 January 2017.
- List of special advisers in post as at 21st December 2016, GOV.uk, accessed 12 January.
- Joanna Penn MPP 2015 on her summer internship], HarvardKennedy School, accessed 12 January 2017.