All medalists.
IMO & IOI, including honourable mentions.
JYJoey YuCanadaIOI2018Wesgroup PropertiesSales AdministratorIndexed profileJBJohan BatubaraIndonesiaIMO2001Competition recordHonourable mention
Johan BerglindSwedenIMO1977Chalmers University of TechnologyInstructor, Algebra and GeometryAutumn profileJBJohan BosmanNetherlandsIMO1997Competition recordSilver medalJBJohan BredbergSwedenIMO2004Østfold University College (HiØ)Associate professor in mathematicsIndexed profile
Johan GunardiIndonesiaIMO2010 · 2011Jump Trading LLCTraderAutumn profileJHJohan HåstadSwedenIMO1976 · 1977 · 1978 · 1979Competition recordBronze medal · Gold medal · Silver medalJHJohan Heinrich Du ToitSouth AfricaIOI2001 · 2002ShopriteXSoftware Development ManagerIndexed profileJKJohan KarlssonSwedenIMO1997 · 1998ZenseactDeep Learning EngineerIndexed profileJKJohan KonterNetherlandsIMO2005OptiplyData Scientist and Product EngineerIndexed profileJMJohan Mustika KartiwaIndonesiaIOI2000GoogleSenior Software EngineerAutumn profileJBJohannes BaderGermanyIOI2011Competition recordBronze medalJGJohannes GirschAustriaIMO2012Competition recordBronze medalJHJohannes HafnerAustriaIMO2009Competition recordBronze medalJJJohannes JosiSwitzerlandIOI2007 · 2008SBB CFF FFSBusiness Data AnalystIndexed profileJJJohannes JosiSwitzerlandIMO2008SBB CFF FFSBusiness Data AnalystIndexed profileJLJohannes LaireFinlandIOI2010 · 2011Competition recordSilver medal · Bronze medalJLJohannes LehtinenFinlandIOI1995Tampere UniversityTeacherIndexed profileJLJohannes LeopoldAustriaIMO1973Competition recordBronze medalJMJohannes Maximilian JacobGermanyIMO2026Competition recordGold medalJNJohannes NordstromSwedenIMO2000RumblestripSoftware EngineerIndexed profileJRJohannes Raitz von FrentzGermanyIMO2024Competition recordBronze medalIndexed profileJGJohann GaulkeGermanyIOI2022 · 2023Attention EngineeringFounding EngineerIndexed profileJHJohann HacklAustriaIMO1970 · 1971VERBUNDVerbund Hydro Power GmbHIndexed profileJNJohan NielsenDenmarkIMO2003Competition recordHonourable mentionJWJohann WilliamsSwitzerlandIMO2020Anglo ScientificIndexed profileJRJohan RådeSwedenIMO1979 · 1981Competition recordBronze medal · Silver medalIndexed profileJSJohan SannemoSwedenIMO2014ModalMember of Technical StaffIndexed profile
Johan SannemoSwedenIOI2012 · 2013 · 2014ModalMember of Technical StaffAutumn profile
Johan SkakDenmarkIMO2020 · 2021Terma GroupStudentermedhjælperIndexed profileJSJohan Sokrates WindNorwayIOI2014 · 2015Competition recordBronze medal · Silver medalJSJohan Sokrates WindNorwayIMO2014 · 2015Competition recordSilver medalJTJohan ThapperSwedenIOI1996Competition recordSilver medalJvJohan van GansNetherlandsIMO1973Competition recordBronze medalIndexed profileJWJohan WästlundSwedenIMO1989Linköping UniversityPhDIndexed profileJYJohan YebbouFranceIMO1978Competition recordBronze medalJAJohn Anthony SimcoxUnited KingdomIMO1989Competition recordHonourable mentionJLJohnathan LeungNew ZealandIMO2018 · 2019The University of North Carolina at Chapel HillTeaching AssistantIndexed profileJBJohn BermanUnited States of AmericaIMO2009Competition recordGold medalJCJohn ChewCanadaIMO1981Competition recordSilver medalJCJohn ClydeUnited States of AmericaIMO1997VentiMathFounderAutumn profileJCJohn CuyaPeruIMO2001 · 2002Competition recordBronze medalJDJohn DanaherUnited States of AmericaIOI2000Competition recordSilver medalJEJohn Edward CremonaUnited KingdomIMO1974Competition recordBronze medalJGJohn Garret C. GoPhilippinesIMO2005BillEaseVP FinanceIndexed profileJGJohn GrahamAustraliaIMO1985Competition recordSilver medalJHJohn HaslegraveUnited KingdomIMO1996Competition recordSilver medalJHJohn HedinSwedenIMO2022 · 2023 · 2024Competition recordBronze medal · Silver medalJLJohn LeyvaColombiaIOI1994Competition recordBronze medalJMJohn Michael WuHong KongIMO2015 · 2016Competition recordSilver medal · Gold medalIndexed profile
Johnny HoUnited States of AmericaIOI2011 · 2012 · 2013PerplexityCofounder, Chief Strategy OfficerAutumn profileJOJohn Olof HallmanSwedenIMO2016Competition recordSilver medal
John OverdeckUnited States of AmericaIMO1986Two Sigma InvestmentsCo-Founder & Co-ChairmanAutumn profile
John PapantoniouAustraliaIMO2012Jane StreetQuantitative TraderAutumn profileJPJohn PardonUnited States of AmericaIOI2005 · 2006 · 2007Competition recordGold medalJPJohn Peter HartleyUnited KingdomIMO1975Competition recordBronze medalJPJohn ProctorUnited KingdomIMO1970Competition recordBronze medalJRJohn Reginald LongleyUnited KingdomIMO1985 · 1986Longley Concrete LtdIndexed profileJRJohn RickardUnited KingdomIMO1975 · 1976 · 1977Competition recordGold medalJRJohn RognesNorwayIMO1984Competition recordBronze medal
Johan BerglindSwedenIMO1977Chalmers University of TechnologyInstructor, Algebra and GeometryAutumn profileJBJohan BosmanNetherlandsIMO1997Competition recordSilver medalJBJohan BredbergSwedenIMO2004Østfold University College (HiØ)Associate professor in mathematicsIndexed profileJohan GunardiIndonesiaIMO2010 · 2011Jump Trading LLCTraderAutumn profileJHJohan HåstadSwedenIMO1976 · 1977 · 1978 · 1979Competition recordBronze medal · Gold medal · Silver medalJHJohan Heinrich Du ToitSouth AfricaIOI2001 · 2002ShopriteXSoftware Development ManagerIndexed profileJKJohan KarlssonSwedenIMO1997 · 1998ZenseactDeep Learning EngineerIndexed profileJKJohan KonterNetherlandsIMO2005OptiplyData Scientist and Product EngineerIndexed profileJMJohan Mustika KartiwaIndonesiaIOI2000GoogleSenior Software EngineerAutumn profileJBJohannes BaderGermanyIOI2011Competition recordBronze medalJGJohannes GirschAustriaIMO2012Competition recordBronze medalJHJohannes HafnerAustriaIMO2009Competition recordBronze medalJJJohannes JosiSwitzerlandIOI2007 · 2008SBB CFF FFSBusiness Data AnalystIndexed profileJJJohannes JosiSwitzerlandIMO2008SBB CFF FFSBusiness Data AnalystIndexed profileJLJohannes LaireFinlandIOI2010 · 2011Competition recordSilver medal · Bronze medalJLJohannes LehtinenFinlandIOI1995Tampere UniversityTeacherIndexed profileJLJohannes LeopoldAustriaIMO1973Competition recordBronze medalJMJohannes Maximilian JacobGermanyIMO2026Competition recordGold medalJNJohannes NordstromSwedenIMO2000RumblestripSoftware EngineerIndexed profileJRJohannes Raitz von FrentzGermanyIMO2024Competition recordBronze medalIndexed profileJGJohann GaulkeGermanyIOI2022 · 2023Attention EngineeringFounding EngineerIndexed profileJHJohann HacklAustriaIMO1970 · 1971VERBUNDVerbund Hydro Power GmbHIndexed profileJNJohan NielsenDenmarkIMO2003Competition recordHonourable mentionJWJohann WilliamsSwitzerlandIMO2020Anglo ScientificIndexed profileJRJohan RådeSwedenIMO1979 · 1981Competition recordBronze medal · Silver medalIndexed profileJSJohan SannemoSwedenIMO2014ModalMember of Technical StaffIndexed profileJohan SannemoSwedenIOI2012 · 2013 · 2014ModalMember of Technical StaffAutumn profileJohan SkakDenmarkIMO2020 · 2021Terma GroupStudentermedhjælperIndexed profileJSJohan Sokrates WindNorwayIOI2014 · 2015Competition recordBronze medal · Silver medalJSJohan Sokrates WindNorwayIMO2014 · 2015Competition recordSilver medalJTJohan ThapperSwedenIOI1996Competition recordSilver medalJvJohan van GansNetherlandsIMO1973Competition recordBronze medalIndexed profileJWJohan WästlundSwedenIMO1989Linköping UniversityPhDIndexed profileJYJohan YebbouFranceIMO1978Competition recordBronze medalJAJohn Anthony SimcoxUnited KingdomIMO1989Competition recordHonourable mentionJLJohnathan LeungNew ZealandIMO2018 · 2019The University of North Carolina at Chapel HillTeaching AssistantIndexed profileJBJohn BermanUnited States of AmericaIMO2009Competition recordGold medalJCJohn ChewCanadaIMO1981Competition recordSilver medalJCJohn ClydeUnited States of AmericaIMO1997VentiMathFounderAutumn profileJCJohn CuyaPeruIMO2001 · 2002Competition recordBronze medalJDJohn DanaherUnited States of AmericaIOI2000Competition recordSilver medalJEJohn Edward CremonaUnited KingdomIMO1974Competition recordBronze medalJGJohn Garret C. GoPhilippinesIMO2005BillEaseVP FinanceIndexed profileJGJohn GrahamAustraliaIMO1985Competition recordSilver medalJHJohn HaslegraveUnited KingdomIMO1996Competition recordSilver medalJHJohn HedinSwedenIMO2022 · 2023 · 2024Competition recordBronze medal · Silver medalJLJohn LeyvaColombiaIOI1994Competition recordBronze medalJMJohn Michael WuHong KongIMO2015 · 2016Competition recordSilver medal · Gold medalIndexed profileJohnny HoUnited States of AmericaIOI2011 · 2012 · 2013PerplexityCofounder, Chief Strategy OfficerAutumn profileJOJohn Olof HallmanSwedenIMO2016Competition recordSilver medalJohn OverdeckUnited States of AmericaIMO1986Two Sigma InvestmentsCo-Founder & Co-ChairmanAutumn profileJohn PapantoniouAustraliaIMO2012Jane StreetQuantitative TraderAutumn profileJPJohn PardonUnited States of AmericaIOI2005 · 2006 · 2007Competition recordGold medalJPJohn Peter HartleyUnited KingdomIMO1975Competition recordBronze medalJPJohn ProctorUnited KingdomIMO1970Competition recordBronze medalJRJohn Reginald LongleyUnited KingdomIMO1985 · 1986Longley Concrete LtdIndexed profileJRJohn RickardUnited KingdomIMO1975 · 1976 · 1977Competition recordGold medalJRJohn RognesNorwayIMO1984Competition recordBronze medal