All medalists.
IMO & IOI, including honourable mentions.
RPRonald Ping Man ChanNew ZealandIOI2008Competition recordSilver medalRPRonald Ping Man ChanNew ZealandIMO2007Competition recordBronze medalRvRonald van der VeldenNetherlandsIOI2003Gurobi OptimizationManager of Technical Account Management EMEAIndexed profileRvRonald van LuijkNetherlandsIMO1994 · 1995Leiden UniversityProfessorIndexed profileRWRonald WidjojoIndonesiaIMO2009 · 2010DKATALISSenior Staff Engineer - DataIndexed profileRDRon DrorNorwayIMO1993Stanford UniversityCheriton Family Professor of Computer ScienceIndexed profileRLRonel LakkerIsraelIMO2020Competition recordSilver medalIndexed profileRGRong GeChinaIOI2004Competition recordGold medal
Roni EdwinGhanaIMO2019 · 2020 · 2021Yale UniversityMathematics PhD studentAutumn profileRKRon KaridiIsraelIMO1983SparkBeyondCTO & Co-FounderIndexed profileRDRonno DasIndiaIMO2010Stockholm UniversityPostdoctoral ResearcherIndexed profileRLRonny López TrujilloCubaIOI2001 · 2002Competition recordBronze medal · Silver medalAutumn profileRRRon RyvchinIsraelIOI2013 · 2014BigArchAlgorithm EngineerIndexed profileRXRon XueAustraliaIOI2025Competition recordBronze medalRERoohollah EbrahimianIslamic Republic of IranIMO1996University of MarylandPrincipal LecturerIndexed profileRSRoope SalmiFinlandIOI2020Finnish IOI trainingCompetitive Programming CoachIndexed profileRSRoope SalmiFinlandIMO2019 · 2020Finnish IOI trainingCompetitive Programming CoachIndexed profileRPRoozbeh PournaderIranIOI1995 · 1996Unicode ConsortiumVice Chair, Script Encoding Working GroupIndexed profileRMRory MooreIrelandIMO2022Competition recordHonourable mentionRARosangel Alexandra Bullon LinaresPeruIOI2024Women in Coding - WICProfesora de programacionIndexed profileRDRosen Dimitrov KralevBulgariaIMO2003 · 2004 · 2005Ritter AlphaDirector of Trading (Vatic Labs, resigned 2026-01-07); Ritter Alpha role index-listedAutumn profileRCRosie CatesUnited KingdomIMO2017Competition recordBronze medalRARoss AtkinsAustraliaIMO2003Telogis, A Verizon CompanyData ScientistIndexed profileRARossen Asenov NikolovBulgariaIMO1976International Monetary FundDeposit Insurance Systems International ConsultantIndexed profileRJRoss JonesAustraliaIMO1986Competition recordBronze medalRDRostislav DevyatovRussian FederationIMO2006Competition recordGold medalIndexed profile
Rostislav RumenovBulgariaIOI2005 · 2006 · 2007Qube Research & TechnologiesQuantitative Technology DirectorAutumn profileRLRotem LissIsraelIOI2010Reshet 13 Media GroupCustomer ManagerIndexed profileRHRovshen HajyyevTurkmenistanIMO2010 · 2011Competition recordBronze medalIndexed profileRBRoya BeheshtiIranIOI1995Washington UniveristyIndexed profileRBRoya Beheshti ZavarehIslamic Republic of IranIMO1994Washington UniveristyIndexed profileRPRoyce PengUnited States of AmericaIMO1990Competition recordSilver medalRYRoyce YaoUnited States of AmericaIMO2026Competition recordGold medalRORuari O'SullivanUnited KingdomIOI2001Self EmployedGames DeveloperIndexed profileRRRubab Redwan SyedBangladeshIOI2016 · 2017Competition recordBronze medalRARuben AndristSwitzerlandIOI2002Competition recordBronze medalRHRuben HambardzumyanArmeniaIMO2021 · 2022Mercor IntelligenceArtificial Intelligence EngineerIndexed profile
Ruben Mason CarpenterSpainIMO2023The D. E. Shaw GroupQuantitative Analyst InternAutumn profile
Rubén Ramírez PadrónCubaIOI1991HCA HealthcareLead Data ScientistAutumn profileRXRubin XuUnited KingdomIOI2006GoogleStaff Software EngineerIndexed profileRRRubmary Rojas LinarezVenezuelaIMO2013MetaSoftware EngineerIndexed profileRBRuby BreydoUnited States of AmericaIMO1991Competition recordBronze medalRARudi Adha PrihandokoIndonesiaIMO2007The Australian National UniversityPHD StudentIndexed profileRBRüdiger BelchGerman Democratic RepublicIMO1989 · 1990Competition recordBronze medalRMRudi MrazovićCroatiaIMO2003 · 2004 · 2005Competition recordBronze medalRKRudolf KusýSlovakiaIMO2024 · 2025 · 2026Competition recordHonourable mention · Bronze medalRPRudolf PolzerGermanyIMO2000 · 2002GoogleSenior Cryptography EngineerIndexed profileRKRūdolfs KreicbergsLatviaIMO2006SorseraCTO & Co-founderIndexed profileRŠRudolf ŠvarcCzechoslovakiaIMO1970Competition recordBronze medalRWRudolf WillingAustriaIMO1976Competition recordBronze medalRBRudradev BasakIndiaIMO2008FacebookSoftware EngineerIndexed profileRDRugilė DzindzalietaitėLithuaniaIMO2024 · 2025 · 2026Competition recordBronze medal · Honourable mentionRHRuhan HabibBangladeshIOI2016 · 2017Competition recordBronze medalRWRuichen WangSouth AfricaIMO2026Competition recordHonourable mentionRJRui Jorge Nunes SequeiraPortugalIMO2006Competition recordHonourable mentionRWRuilin WangUnited States of AmericaIMO2025 · 2026Competition recordGold medalRLRui Lopes Viana FilhoBrazilIMO1997 · 1998Competition recordSilver medal · Gold medalRXRuiming XiongCanadaIMO2017FinastraSoftware QA EngineerIndexed profileRZRuiming ZhangSwedenIMO2025Competition recordBronze medalRHRuimin HeSingaporeIMO1998Ministry of Digital Development and Information-Indexed profile
Roni EdwinGhanaIMO2019 · 2020 · 2021Yale UniversityMathematics PhD studentAutumn profileRKRon KaridiIsraelIMO1983SparkBeyondCTO & Co-FounderIndexed profileRDRonno DasIndiaIMO2010Stockholm UniversityPostdoctoral ResearcherIndexed profileRLRonny López TrujilloCubaIOI2001 · 2002Competition recordBronze medal · Silver medalAutumn profileRRRon RyvchinIsraelIOI2013 · 2014BigArchAlgorithm EngineerIndexed profileRXRon XueAustraliaIOI2025Competition recordBronze medalRERoohollah EbrahimianIslamic Republic of IranIMO1996University of MarylandPrincipal LecturerIndexed profileRSRoope SalmiFinlandIOI2020Finnish IOI trainingCompetitive Programming CoachIndexed profileRSRoope SalmiFinlandIMO2019 · 2020Finnish IOI trainingCompetitive Programming CoachIndexed profileRPRoozbeh PournaderIranIOI1995 · 1996Unicode ConsortiumVice Chair, Script Encoding Working GroupIndexed profileRMRory MooreIrelandIMO2022Competition recordHonourable mentionRARosangel Alexandra Bullon LinaresPeruIOI2024Women in Coding - WICProfesora de programacionIndexed profileRDRosen Dimitrov KralevBulgariaIMO2003 · 2004 · 2005Ritter AlphaDirector of Trading (Vatic Labs, resigned 2026-01-07); Ritter Alpha role index-listedAutumn profileRCRosie CatesUnited KingdomIMO2017Competition recordBronze medalRARoss AtkinsAustraliaIMO2003Telogis, A Verizon CompanyData ScientistIndexed profileRARossen Asenov NikolovBulgariaIMO1976International Monetary FundDeposit Insurance Systems International ConsultantIndexed profileRJRoss JonesAustraliaIMO1986Competition recordBronze medalRDRostislav DevyatovRussian FederationIMO2006Competition recordGold medalIndexed profileRostislav RumenovBulgariaIOI2005 · 2006 · 2007Qube Research & TechnologiesQuantitative Technology DirectorAutumn profileRLRotem LissIsraelIOI2010Reshet 13 Media GroupCustomer ManagerIndexed profileRHRovshen HajyyevTurkmenistanIMO2010 · 2011Competition recordBronze medalIndexed profileRBRoya BeheshtiIranIOI1995Washington UniveristyIndexed profileRBRoya Beheshti ZavarehIslamic Republic of IranIMO1994Washington UniveristyIndexed profileRPRoyce PengUnited States of AmericaIMO1990Competition recordSilver medalRYRoyce YaoUnited States of AmericaIMO2026Competition recordGold medalRORuari O'SullivanUnited KingdomIOI2001Self EmployedGames DeveloperIndexed profileRRRubab Redwan SyedBangladeshIOI2016 · 2017Competition recordBronze medalRARuben AndristSwitzerlandIOI2002Competition recordBronze medalRHRuben HambardzumyanArmeniaIMO2021 · 2022Mercor IntelligenceArtificial Intelligence EngineerIndexed profileRuben Mason CarpenterSpainIMO2023The D. E. Shaw GroupQuantitative Analyst InternAutumn profileRubén Ramírez PadrónCubaIOI1991HCA HealthcareLead Data ScientistAutumn profileRXRubin XuUnited KingdomIOI2006GoogleStaff Software EngineerIndexed profileRRRubmary Rojas LinarezVenezuelaIMO2013MetaSoftware EngineerIndexed profileRBRuby BreydoUnited States of AmericaIMO1991Competition recordBronze medalRARudi Adha PrihandokoIndonesiaIMO2007The Australian National UniversityPHD StudentIndexed profileRBRüdiger BelchGerman Democratic RepublicIMO1989 · 1990Competition recordBronze medalRMRudi MrazovićCroatiaIMO2003 · 2004 · 2005Competition recordBronze medalRKRudolf KusýSlovakiaIMO2024 · 2025 · 2026Competition recordHonourable mention · Bronze medalRPRudolf PolzerGermanyIMO2000 · 2002GoogleSenior Cryptography EngineerIndexed profileRKRūdolfs KreicbergsLatviaIMO2006SorseraCTO & Co-founderIndexed profileRŠRudolf ŠvarcCzechoslovakiaIMO1970Competition recordBronze medalRWRudolf WillingAustriaIMO1976Competition recordBronze medalRBRudradev BasakIndiaIMO2008FacebookSoftware EngineerIndexed profileRDRugilė DzindzalietaitėLithuaniaIMO2024 · 2025 · 2026Competition recordBronze medal · Honourable mentionRHRuhan HabibBangladeshIOI2016 · 2017Competition recordBronze medalRWRuichen WangSouth AfricaIMO2026Competition recordHonourable mentionRJRui Jorge Nunes SequeiraPortugalIMO2006Competition recordHonourable mentionRWRuilin WangUnited States of AmericaIMO2025 · 2026Competition recordGold medalRLRui Lopes Viana FilhoBrazilIMO1997 · 1998Competition recordSilver medal · Gold medalRXRuiming XiongCanadaIMO2017FinastraSoftware QA EngineerIndexed profileRZRuiming ZhangSwedenIMO2025Competition recordBronze medalRHRuimin HeSingaporeIMO1998Ministry of Digital Development and Information-Indexed profile