Zhaorong Jin

Mathematician (Princeton math PhD, Caltech math BS) and IMO 2011 gold medalist for China, working in quantitative trading. Index-derived employment records list a 2019 Quantitative Research Intern role at SIG and a Quantitative Researcher role at Citadel Securities from 2020.

Notes6

• Quant employment verification: CONFIRMED. Index/aggregator-derived employment records list two actual roles at bona fide quantitative trading firms: Quantitative Research Intern at Susquehanna International Group (SIG, a proprietary trading/market-making firm; Bala Cynwyd PA), June-Aug 2019 per the caller lead, and Quantitative Researcher at Citadel Securities (a market maker / electronic trading firm, Chicago), listed as current since 2020. Identity is supported by independent primary sources (IMO 2011 gold medalist for China; Caltech math BS 2011-2015; Princeton math PhD 2015-2020; arXiv 1309.4101 with Caltech's Matilde Marcolli). Caveat: the role records themselves come only from the LinkedIn-derived index and derivative people-aggregator listings (ZoomInfo/Lead411) - NOT an independent company primary source; and the index lists the Citadel role as current, which the task says not to treat as proven current. No conflicting employer evidence was found.2020
• Employer classification checks: Citadel Securities is an electronic market-making firm (principal trading) and Susquehanna International Group (SIG) is a proprietary trading/market-making firm - both are genuine quantitative finance employers, so these roles satisfy the quantitative-finance criterion regardless of the index caveat.2020
• IMO 2011 (Amsterdam): gold medal, rank 25 of 563, scoring 7/1/7/7/7/0 = 29; part of China's 6-member team that placed 1st overall. This is the olympiad identity named in the brief.Jul 2011
• Education is documented across three source families and agrees: Caltech BS in Mathematics 2011-2015 (immediately after IMO 2011) then Princeton PhD in Mathematics 2015-2020; the same name appears on a 2013 Caltech Putnam team and a 2013 Caltech-affiliated arXiv paper, which anchors the undergraduate years.
• At Caltech, was one of the three highest Caltech scorers on the 2013 William Lowell Putnam Mathematical Competition, placing the Caltech team 5th nationally (teammates Xiangyi Huang and Tian Nie listed alphabetically).Dec 2013
• Co-authored 'Endomotives of toric varieties' (arXiv:1309.4101, submitted 16 Sep 2013; published J. Geom. Phys. 2014) with Caltech professor Matilde Marcolli, connecting toric varieties to endomotives, quantum statistical mechanics and F1-geometry.Sep 2013
• Kaggle profile 'jinzhr93' self-describes as 'a fourth year PhD student in mathematics at Princeton,' located in Princeton NJ, account joined ~2018 with 2 competitions and 1 discussion, last seen ~2020 - a secondary self-identification tying the math identity to Princeton.2018
• No personal website, GitHub, X/Twitter, or published email surfaced in search; public footprint is limited to LinkedIn, Kaggle, arXiv, and competition/aggregator records, so contact fields are left absent rather than guessed.