All medalists.
IMO & IOI, including honourable mentions.
GMGoodarz MehrIslamic Republic of IranIMO2012Virginia TechIndexed profile
Gopal GoelUnited States of AmericaIMO2020RoxAgent Foundations LeadAutumn profileGDGoran DražićCroatiaIMO2004 · 2005 · 2006Competition recordBronze medal · Silver medalGPGoran PredovićYugoslaviaIMO1998Competition recordHonourable mentionIndexed profileGŽGoran ŽužićCroatiaIMO2008 · 2009GoogleStaff Research ScientistIndexed profileGŽGoran ŽužićCroatiaIOI2006 · 2007 · 2008 · 2009GoogleStaff Research ScientistIndexed profile
Gorazd BrumenSloveniaIMO1995Fidelity Digital Assets Services, LLCPrincipal Software EngineerAutumn profileGCGorazd CvetičYugoslaviaIMO1977Universidad Tecnica Federico Santa Mariaprofessor of physicsIndexed profileGSGordan SavinYugoslaviaIMO1979Competition recordBronze medalGDGordon DeaneAustraliaIMO1995Swan EndoSurgical Inc.Principal Software EngineerIndexed profileGHGösta HesslowSwedenIMO1977Competition recordSilver medalGWGötz WiesendGermanyIMO1986Competition recordSilver medal
Grace YuanAustraliaIMO2022Harvard Medical SchoolResearch InternAutumn profile
Grady KenixNew ZealandIMO2022Recursive DragonComputer Science MentorAutumn profileGDGraeme David KemkesCanadaIOI1997Competition recordBronze medalGMGraham ManuellSouth AfricaIOI2010Competition recordBronze medalGWGraham WhiteAustraliaIMO2004 · 2005 · 2006Competition recordHonourable mention · Bronze medal · Silver medalGPGregg PatrunoUnited States of AmericaIMO1981Competition recordSilver medalGJGreg JacksonSouth AfricaIMO2009 · 2010Competition recordHonourable mention · Bronze medal
Grégoire GenestLuxembourgIMO2009 · 2010 · 2011Albert SchoolFounder & CEOAutumn profileGGGregor GrasselliSloveniaIMO2009BlueOcean GamingFull Stack EngineerIndexed profileGSGregorio SalazarColombiaIMO2018 · 2019 · 2020Competition recordBronze medal · Honourable mention · Silver medalGKGregor KikeljSloveniaIOI2018Programerske storitve Gregor Kikelj S.P.Software EngineerIndexed profileGMGregor MatlGermanyIOI2014AlgonautinCo-FounderIndexed profileGDGregory DebruyneBelgiumIMO2009FWOPostdoctoraal onderzoekerIndexed profileGPGregory PriceUnited States of AmericaIOI2000Competition recordBronze medalGSGrégory SoyezBelgiumIMO1996Brookhaven National LaboratoryResearch AssociateIndexed profileGKGreta KuprijanovaitėLithuaniaIMO2009 · 2010Competition recordBronze medalGPGreta PanovaBulgariaIMO1999 · 2000 · 2001University of Southern CaliforniaProfessorIndexed profileGVGrgur ValentićCroatiaIMO2010Competition recordBronze medalGAGrigor AslanyanArmeniaIMO2001GoogleSenior Software EngineerIndexed profileGGGrigor GrigorovBulgariaIMO1994 · 1995DXC TechnologySecurity Incident Response and Forensics Technical LeadIndexed profileGBGrigori BagdasaryanArmeniaIMO1996 · 1997Competition recordBronze medalGGGrigori GrozmanSwedenIMO2003COMSOL, Inc.Senior Software DeveloperIndexed profileGIGrigorii IurginRussian FederationIMO2016Competition recordGold medalGKGrigorii KukanovGermanyIMO2026Competition recordBronze medalGRGrigorii RybnikovUnion of Soviet Socialist RepublicsIMO1977Competition recordGold medal
Grigorij PerelmanUnion of Soviet Socialist RepublicsIMO1982Steklov Institute of Mathematics, St. Petersburg (resigned 2005)Mathematician (withdrawn from professional mathematics since 2006)Autumn profile
Grigori MargulisUnion of Soviet Socialist RepublicsIMO1962Yale UniversityErastus L. DeForest Professor of Mathematics (Emeritus)Autumn profileGRGrigoriy ReznikovRussiaIOI2016Utrecht UniversityPhD CandidateIndexed profileGRGrigoriy RosenblumUnion of Soviet Socialist RepublicsIMO1966Competition recordGold medal
Grigor KeropyanArmeniaIMO2014 · 2015WorldQuantVice President, ResearchAutumn profileGAGriua ArsuRomaniaIMO1975Competition recordBronze medalGAGrzegorz AndrzejczakPolandIMO1972 · 1973University of LodzprofessorIndexed profileGBGrzegorz BobińskiPolandIMO1994Nicolaus Copernicus UniversityAssistant ProfessorIndexed profileGDGrzegorz DłużewskiPolandIMO2016Quickchat AIMachine Learning EngineerIndexed profileGJGrzegorz JakackiPolandIOI1993Data RevivalInvestorIndexed profileGKGrzegorz KapustkaPolandIMO1997University of ZurichPostdoctoral FellowIndexed profileGŁGrzegorz ŁabędzkiPolandIMO1987 · 1988UnicoderWłaścicielIndexed profileGZGrzegorz ZwaraPolandIMO1988 · 1989 · 1990 · 1991Competition recordSilver medal
Guan-Chen ChenTaiwanIOI2020GoogleSoftware EngineerAutumn profileGGGuangping GaoChinaIOI1994 · 1995Competition recordGold medal · Bronze medal
Guangxuan ZhangSingaporeIOI2016 · 2017Competition recordBronze medal · Silver medalAutumn profileGLGuanhan LiNew ZealandIOI2023 · 2024Competition recordBronze medal · Silver medalGHGuan Han LiNew ZealandIMO2026Competition recordSilver medalGFGuðbjörn Freyr JónssonIcelandIMO1988 · 1989Competition recordBronze medal · Honourable mentionIndexed profileGRGuðmundur Reynir GunnarssonIcelandIMO2006 · 2007 · 2008S.W.ANMusicianIndexed profileGHGudrun HametnerAustriaIMO1988 · 1989Competition recordBronze medal · Silver medalGAGueorgui AnguelovBulgariaIMO1997FreelanceSoftware DeveloperIndexed profileGMGuevara Manuel Ángel Guevara LópezMexicoIMO2005 · 2006Competition recordBronze medal
Gopal GoelUnited States of AmericaIMO2020RoxAgent Foundations LeadAutumn profileGDGoran DražićCroatiaIMO2004 · 2005 · 2006Competition recordBronze medal · Silver medalGPGoran PredovićYugoslaviaIMO1998Competition recordHonourable mentionIndexed profileGŽGoran ŽužićCroatiaIMO2008 · 2009GoogleStaff Research ScientistIndexed profileGŽGoran ŽužićCroatiaIOI2006 · 2007 · 2008 · 2009GoogleStaff Research ScientistIndexed profileGorazd BrumenSloveniaIMO1995Fidelity Digital Assets Services, LLCPrincipal Software EngineerAutumn profileGCGorazd CvetičYugoslaviaIMO1977Universidad Tecnica Federico Santa Mariaprofessor of physicsIndexed profileGSGordan SavinYugoslaviaIMO1979Competition recordBronze medalGDGordon DeaneAustraliaIMO1995Swan EndoSurgical Inc.Principal Software EngineerIndexed profileGHGösta HesslowSwedenIMO1977Competition recordSilver medalGWGötz WiesendGermanyIMO1986Competition recordSilver medalGrace YuanAustraliaIMO2022Harvard Medical SchoolResearch InternAutumn profileGrady KenixNew ZealandIMO2022Recursive DragonComputer Science MentorAutumn profileGDGraeme David KemkesCanadaIOI1997Competition recordBronze medalGMGraham ManuellSouth AfricaIOI2010Competition recordBronze medalGWGraham WhiteAustraliaIMO2004 · 2005 · 2006Competition recordHonourable mention · Bronze medal · Silver medalGPGregg PatrunoUnited States of AmericaIMO1981Competition recordSilver medalGJGreg JacksonSouth AfricaIMO2009 · 2010Competition recordHonourable mention · Bronze medalGrégoire GenestLuxembourgIMO2009 · 2010 · 2011Albert SchoolFounder & CEOAutumn profileGGGregor GrasselliSloveniaIMO2009BlueOcean GamingFull Stack EngineerIndexed profileGSGregorio SalazarColombiaIMO2018 · 2019 · 2020Competition recordBronze medal · Honourable mention · Silver medalGKGregor KikeljSloveniaIOI2018Programerske storitve Gregor Kikelj S.P.Software EngineerIndexed profileGMGregor MatlGermanyIOI2014AlgonautinCo-FounderIndexed profileGDGregory DebruyneBelgiumIMO2009FWOPostdoctoraal onderzoekerIndexed profileGPGregory PriceUnited States of AmericaIOI2000Competition recordBronze medalGSGrégory SoyezBelgiumIMO1996Brookhaven National LaboratoryResearch AssociateIndexed profileGKGreta KuprijanovaitėLithuaniaIMO2009 · 2010Competition recordBronze medalGPGreta PanovaBulgariaIMO1999 · 2000 · 2001University of Southern CaliforniaProfessorIndexed profileGVGrgur ValentićCroatiaIMO2010Competition recordBronze medalGAGrigor AslanyanArmeniaIMO2001GoogleSenior Software EngineerIndexed profileGGGrigor GrigorovBulgariaIMO1994 · 1995DXC TechnologySecurity Incident Response and Forensics Technical LeadIndexed profileGBGrigori BagdasaryanArmeniaIMO1996 · 1997Competition recordBronze medalGGGrigori GrozmanSwedenIMO2003COMSOL, Inc.Senior Software DeveloperIndexed profileGIGrigorii IurginRussian FederationIMO2016Competition recordGold medalGKGrigorii KukanovGermanyIMO2026Competition recordBronze medalGRGrigorii RybnikovUnion of Soviet Socialist RepublicsIMO1977Competition recordGold medalGrigorij PerelmanUnion of Soviet Socialist RepublicsIMO1982Steklov Institute of Mathematics, St. Petersburg (resigned 2005)Mathematician (withdrawn from professional mathematics since 2006)Autumn profileGrigori MargulisUnion of Soviet Socialist RepublicsIMO1962Yale UniversityErastus L. DeForest Professor of Mathematics (Emeritus)Autumn profileGRGrigoriy ReznikovRussiaIOI2016Utrecht UniversityPhD CandidateIndexed profileGRGrigoriy RosenblumUnion of Soviet Socialist RepublicsIMO1966Competition recordGold medalGrigor KeropyanArmeniaIMO2014 · 2015WorldQuantVice President, ResearchAutumn profileGAGriua ArsuRomaniaIMO1975Competition recordBronze medalGAGrzegorz AndrzejczakPolandIMO1972 · 1973University of LodzprofessorIndexed profileGBGrzegorz BobińskiPolandIMO1994Nicolaus Copernicus UniversityAssistant ProfessorIndexed profileGDGrzegorz DłużewskiPolandIMO2016Quickchat AIMachine Learning EngineerIndexed profileGJGrzegorz JakackiPolandIOI1993Data RevivalInvestorIndexed profileGKGrzegorz KapustkaPolandIMO1997University of ZurichPostdoctoral FellowIndexed profileGŁGrzegorz ŁabędzkiPolandIMO1987 · 1988UnicoderWłaścicielIndexed profileGZGrzegorz ZwaraPolandIMO1988 · 1989 · 1990 · 1991Competition recordSilver medalGuan-Chen ChenTaiwanIOI2020GoogleSoftware EngineerAutumn profileGGGuangping GaoChinaIOI1994 · 1995Competition recordGold medal · Bronze medalGuangxuan ZhangSingaporeIOI2016 · 2017Competition recordBronze medal · Silver medalAutumn profileGLGuanhan LiNew ZealandIOI2023 · 2024Competition recordBronze medal · Silver medalGHGuan Han LiNew ZealandIMO2026Competition recordSilver medalGFGuðbjörn Freyr JónssonIcelandIMO1988 · 1989Competition recordBronze medal · Honourable mentionIndexed profileGRGuðmundur Reynir GunnarssonIcelandIMO2006 · 2007 · 2008S.W.ANMusicianIndexed profileGHGudrun HametnerAustriaIMO1988 · 1989Competition recordBronze medal · Silver medalGAGueorgui AnguelovBulgariaIMO1997FreelanceSoftware DeveloperIndexed profileGMGuevara Manuel Ángel Guevara LópezMexicoIMO2005 · 2006Competition recordBronze medal