Whan Ghang

Whan Ghang is a Principal Researcher at Samsung Advanced Institute of Technology in Seoul, working on quantum algorithms. He was trained in mathematics, with a BSc from MIT and a PhD from Harvard, and represented the Republic of Korea at the International Mathematical Olympiad in 2005, 2006 and 2007, winning silver then two gold medals. His career path runs through academic research and quantitative finance: a Researcher post at the National Institute for Mathematical Sciences, then Quantitative Researcher at Jump Trading LLC, before joining Samsung.

Notes7

• Quant employment verification: CONFIRMED. A role as Quantitative Researcher at Jump Trading LLC (Jul 2019-Oct 2020) is reported for Whan Ghang by the LinkedIn-derived people index and the aggregated profile record; Jump Trading is a proprietary high-frequency trading firm (Wikipedia: 'American financial market trading firm', founded 1999, Chicago), which is squarely quantitative trading. Identity is supported independently: the same record ties the MIT BSc / Harvard PhD mathematics profile to the IMO-Korea olympiad identity, and the contact email and research output match one person. Note the employment dates remain index/aggregator-sourced, not yet corroborated by a company or first-party page.
• Career timeline from a people-data aggregator (index-only, NOT independent primary-source confirmation): Principal Researcher at Samsung Advanced Institute of Technology (Mar 2024-Present); Staff Researcher at the same (Dec 2020-Feb 2024); Quantitative Researcher at Jump Trading LLC (Jul 2019-Oct 2020); Researcher at National Institute for Mathematical Sciences (Jul 2014-Jul 2017). The Jul 2017-Jun 2019 span is unexplained by the aggregator.
• Distinctive achievement chain: three-time Putnam Fellow (2010, 2011, 2012) while an MIT undergraduate, one of the highest individual ranks in the William Lowell Putnam Mathematical Competition, in the same years he was publishing undergraduate research (log-Sobolev inequality; surface-area-minimizing tiles).
• At Samsung Advanced Institute of Technology the publicly traceable research is applied cryptography and quantum algorithms: co-author of 'General bootstrapping approach for RLWE-based homomorphic encryption' (IEEE Transactions on Computers, 2024; 108 citations), a shift from his earlier pure-mathematics and evolutionary-game-theory work toward industrial algorithm research.
• Aggregator-listed contact email [contact omitted] (reported 'most updated', updated 2025-12-10 on the source); not an independent primary-source confirmation of identity.
• Harvard PhD work with Martin A. Nowak on indirect reciprocity (optional interactions and private information) produced two 2014-2015 papers in Journal of Theoretical Biology and Games; both are among his most-cited works (66 and 37 citations).
• Olympiad-to-quant path is a factual sequence only: IMO 2005-2007 (Korea) -> MIT BSc mathematics / three-time Putnam Fellow (2010-2012) -> Harvard math PhD (indirect reciprocity) -> National Institute for Mathematical Sciences researcher (2014-2017) -> Jump Trading quantitative researcher (2019-2020) -> Samsung Advanced Institute of Technology (2020-present). No source states a causal or recruiting link between any of these steps.
• Unresolved employment question: the index-reported timeline leaves Jul 2017-Jun 2019 unaccounted for (between the NIMS researcher post ending Jul 2017 and the Jump Trading role starting Jul 2019), plausibly doctoral-completion years at Harvard, but no source examined states his Harvard PhD completion date, so the interval is left open rather than filled.
• Competitive record: represented the Republic of Korea at the International Mathematical Olympiad three consecutive years (2005, 2006, 2007), scoring 30 (Silver), 28 (Gold), and 32 (Gold) respectively; his IMO rank was 89.1st, 94.8th and 98.9th percentile across those years.
• Undergraduate research output (2012-2014) spans analysis and discrete geometry - a sharp log-Sobolev inequality on a compact interval and perimeter-/surface-area-minimizing tiles - co-authored with Z. Martin, S. Waruhiu, P. Gallagher, D. Hu and others, indicating a pure-math research trajectory before the applied/industrial turn.