Ruben Carpenter

Ruben Carpenter is a mathematics student at Yale University, originally from Barcelona, Spain. He represented Spain at the 64th International Mathematical Olympiad (IMO 2023), winning a silver medal with a score of 31 (rank 55/618), and has a gold medal from the 38th IberoAmerican Mathematical Olympiad. At Yale he is pursuing a Combined B.S./M.S. in mathematics (entered 2023), previously attending Aula Escola Europea in Barcelona. He authored the paper 'Taming Irrationality: An Invariance Principle for the Random Billiard Walk' (arXiv, 2025) from the Duluth REU, and in 2026 received Yale's Anthony D. Stanley Memorial Prize for excellence in pure and applied mathematics.

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• Quant employment verification: CONFIRMED. Ruben Carpenter has actual quantitative-finance internship roles at The D. E. Shaw Group, a major quantitative/algorithmic hedge fund. LinkedIn (index) lists two 2026 roles: 'Quantitative Analyst Intern' (New York) and 'Incoming Quantitative Research Intern', both at deshaw.com. This is corroborated by a primary source that is not an index: Yale's Department of Mathematics 2026 prize page (dated 2026-05-19) quotes Carpenter saying that 'This summer, he looks forward to doing research at DE Shaw', i.e. a research internship at the firm. Employer classification: D. E. Shaw & Co. is an American quantitative hedge fund (Wikipedia: hedge fund founded 1988, known for computational/algorithmic trading), so roles there are genuine quant-finance roles. Identity is supported independently (Wikidata Q137604375 Spanish mathematics student; IMO 2023 silver for Spain; Yale maths student from Barcelona). These are internships/research positions, not student insight days, camps or scholarships, so they meet the CONFIRMED bar; the roles rest on LinkedIn-index claims plus one primary-source confirmation, so treat exact dates as index-only.May 19, 2026
• Won the silver medal for Spain at the 64th International Mathematical Olympiad (IMO 2023) with a score of 31 and rank 55th of 618; moresults.org records the result under the name 'Ruben Mason Carpenter', country Spain.Jul 2023
• Awarded Yale's Anthony D. Stanley Memorial Prize (2026), given to a junior for excellence in pure and applied mathematics; the same page describes him as a junior from Barcelona, Spain, doing research in additive combinatorics.May 19, 2026
• The D. E. Shaw Group role titles are recorded on LinkedIn as 'Incoming Quantitative Research Intern' and 'Quantitative Analyst Intern', both dated 2026-, New York; the 'Incoming' label plus the May 2026 Yale quote ('looks forward to doing research at DE Shaw') indicate the analyst internship was an offer still upcoming as of May 2026, while the spring 2026 status line maps both to a 2026 start.2026
• Sole author of the mathematics paper 'Taming Irrationality: An Invariance Principle for the Random Billiard Walk' (arXiv 2508.12849, 2025), which resolves a problem posed by Defant, Jiradilok and Mossel on combinatorial billiards; the work was done at the Duluth REU.Aug 2025
• D. E. Shaw & Co. is an American quantitative hedge fund founded in 1988, known for computational and algorithmic trading, which classifies the employer as quantitative finance.2026
• Presented 'Taming Irrationality: An Invariance Principle for the Random Billiard Walk' at the 2026 Joint Mathematics Meetings (AMS), listed under Ruben Mason Carpenter, Yale University.2026
• Wikidata Q137604375 identifies Ruben Mason Carpenter as a Spanish mathematics student, citizen of Spain, born 2005 in Barcelona; the IMO roster names him 'Ruben Mason Carpenter' representing Spain (ES).2026
• Spanish press (Telecinco, 2023-07-20) described him as a 17-year-old Catalan student whose IMO result was Spain's best individual placement in 41 years, and noted he also competed at the Physics Olympiad (IPhO), winning bronze.Jul 20, 2023
• Holds a gold medal from the 38th IberoAmerican Mathematical Olympiad, consistent with a top-tier Spanish olympiad competitor.2023
• Raised in Barcelona, attending Aula Escola Europea (2021-2023) before Yale; education record lists a Combined B.S./M.S. in mathematics at Yale University (2023-2027).2026
• Took first place among second-year students in Yale's 2025 Barge Contest, a three-hour mathematics competition for first- and second-year students.Apr 26, 2025