Paul Jefferys

Paul Jefferys is a UK mathematician and quantitative trader with an elite olympiad record (four IMO medals for the UK, 2001-2004, and the 2004 International Olympiad in Informatics world title) and a first-class Maths degree from Trinity College, Cambridge. He spent roughly nine years at UBS in quantitative trading, rising to head of cash equity quantitative trading for Europe and running the bank's global central risk book, becoming a managing director at 28. In 2017 he moved to Citadel as head of CLB trading and quantitative portfolio manager. Press sources confirm the UBS and Citadel employment; later role dates and a reported move to Jain Global rest on an unverified LinkedIn index.

Notes6

• Quant employment verification: CONFIRMED. Independent non-index press establishes a real quantitative-finance career for Paul Jefferys of the UK 2001-2004 IMO team: The Trade News (2017-11-13) names 'Paul Jefferys, head of CLB trading and quantitative portfolio manager, Citadel LLC', and Financial News reports he ran UBS's global central risk book and reached MD at 28 before joining Citadel (Ken Griffin's hedge fund) in 2017. Employer classification: Citadel and UBS are genuine quantitative trading/market-making organisations (Citadel = hedge fund and market maker; UBS = investment bank with a quantitative trading franchise). The later Jain Global role (central risk book) is index/LinkedIn only. Index-derived role dates are not treated as primary-source confirmation.Nov 13, 2017
• The Trade News 2017 'Rising Stars' feature describes Jefferys as a 'maths genius' by colleagues who joined Citadel from UBS in 2017 and had risen 'through the ranks of its quantitative trading team' to run the Swiss bank's global central risk book at 28, holding roles including head of cash equity quantitative trading for Europe.Nov 13, 2017
• Financial News (2017-04-19) reported Jefferys was leaving UBS's central risk book for Citadel, having achieved the rank of MD at just 28; the follow-up (2017-05-31) framed the move as part of banks and hedge funds 'battling each other for quantitative trading talent', with UBS replacing him with a Citi trader.Apr 19, 2017
• Trinity College Cambridge 'Pairings' piece (2017-07-24) profiles 'Paul Jefferys, Alumnus; Quantitative Trader', and he describes being supervised by Imre Leader, Fellow in Mathematics, in his first term - a first-party confirmation of both the Cambridge maths background and a quantitative-trader occupation.Jul 24, 2017
• IMO record: Jefferys represented the United Kingdom in 2001, 2002, 2003 and 2004, winning Bronze (2001), Silver (2002) and Gold (2003, 2004). The IMO results database lists a United Kingdom contestant matching those four years with those medals; the database page itself was retrieved but rendered a 'page does not exist' shell with only the ranking-history table.2004
• Senior Wrangler: Jefferys took a first-class Cambridge Maths degree (Trinity College) in 2007 with a reported 96% average, described as the highest post-war Maths first the university had seen; he also won the G.F.A. Osborn Prize, the Ver Heyden de Lancey Prize, several Yeats mathematical essay prizes, and was listed in the Varsity 100. (From a deleted-Wikipedia mirror; treat the superlative claims as unverified.)
• Identity linkage: the Olympiad/competition record (IMO 2001-2004, IOI champion), the Trinity College Cambridge Maths degree, and the UBS/Citadel quant-trader career are consistently linked across press and college sources, but the highest-confidence employment evidence (Financial News, The Trade News) does not itself name the Olympiad participant - the two strands are joined by name, Cambridge/Trinity, and the PhD-level maths profile rather than one single source stating both.Apr 19, 2017
• Comp programming record: world informatics champion (top gold medal) at the International Olympiad in Informatics on 2004-09-17 after silver medals in 2002 and 2003; TopCoder Open finalist in 2008, 2010, 2011 and 2012 and Google Code Jam finalist in 2008 and 2010. This is competition record, not employment.Sep 17, 2004
• Education: first-class degree in Economics from the Open University in 2003 (aged 17) and ten A-levels at grade A in 2004 (average 95%), reported as a UK record at the time; the 10-A-level result was also covered by The Times. Open University/A-level claims come from a deleted-Wikipedia mirror.2004
• Career timeline as an index/LinkedIn-only claim (not independently confirmed): UBS Quant Trader Sep 2008-Jul 2017; UBS Head of Cash Equity Quantitative Trading Europe Apr 2014-Mar 2016; Citadel Head of CLB Trading and Quantitative PM Jul 2017-Jan 2021; Citadel Head of quant trading research and event-driven PM Jan 2021-Jan 2022; Citadel Portfolio Manager Jan 2022-Apr 2023. Press independently confirms the UBS-to-Citadel move in 2017 but not the finer internal dates.
• Current/recent role (LOW confidence, index/LinkedIn only): Head of Center Book, Scaling and Execution at Jain Global, Bobby Jain's multi-manager hedge fund, per the LinkedIn index row and a LinkedIn headline 'CRB / Scaling / Rebal'. Not confirmed by any primary or press source; a 'current employment' claim should not be inferred from this index entry alone.
• UBS Academic Scholarship Award worth GBP 100,000 in 2005 - a scholarship, not employment, and predating his quant roles at the bank.2005