All medalists.
IMO & IOI, including honourable mentions.
CBChady Ben HamidaTunisiaIMO2016 · 2017MetaSenior Software EngineerIndexed profileCKChaemin KimRepublic of KoreaIMO2026Competition recordHonourable mentionCKChaewon KimRepublic of KoreaIMO2015Competition recordBronze medalAutumn profile
Chai HaixinChinaIOI1989LenovoExecutive DirectorAutumn profileCKChai Kian MingSingaporeIOI1993 · 1994DPI Holdings BerhadDeputy Managing DirectorIndexed profile
Chaitanya RaoAustraliaIMO1994Institute of DataLead Trainer, Head of Learning (Data Science) and Product Development ManagerAutumn profileCTChaitanya TappuIndiaIMO2014Competition recordBronze medalCMChaiyasit ManovitThailandIOI1993Competition recordSilver medalIndexed profileCFChak Fai YuenHong Kong, ChinaIOI2010Competition recordSilver medalIndexed profileCHChak Hei YuenHong KongIMO2006Competition recordBronze medalCEChams Eddine Abd El Ali DerrecheAlgeriaIMO2023 · 2024Competition recordBronze medal · Gold medalCCChan Chia KhowMalaysiaIMO1996Competition recordHonourable mentionCTChandhopama Thidas Bandara WanasingheSri LankaIMO2020 · 2022 · 2023Competition recordHonourable mentionCAChandresh Amrit RamlaganTrinidad and TobagoIMO2008 · 2009MercorMathematics ResearcherAutumn profileCFChan Fong WongMacao, ChinaIOI1999Competition recordBronze medalCHChang Hao TsaiTaiwanIOI1994 · 1995Competition recordBronze medal · Silver medalCZChangjin ZhengChinaIMO1997Competition recordGold medalCJChang Jun LimMalaysiaIOI2024 · 2025Singapore Informatics LeagueScientific Committee MemberIndexed profileCYChangkai YuSingaporeIMO1989 · 1990Competition recordBronze medal · Honourable mentionCLChangsu LeeRepublic of KoreaIOI2014QuoraSoftware EngineerIndexed profileCYChang Yang YewMalaysiaIMO2003Royal Hobart HospitalAnesthesiology ResidentIndexed profileCMChangzhi Michel YangBelgiumIMO2026Competition recordBronze medalCXChangzhi XieChinaIMO2015University of Southern CaliforniaPhD Student, Computer ScienceAutumn profileCHChan Hwai-LianTaiwanIMO1996 · 1997Competition recordSilver medalCJChan-Il JungRepublic of KoreaIOI2003Competition recordSilver medalCLChanin LaohaphanThailandIOI2004KASIKORN Business-Technology Group [KBTG]Data & AI Program Manager (Head of Level)Indexed profileCMChan Min KimRepublic of KoreaIOI2008GoogleSoftware EngineerIndexed profileCSChan Sin HuanSingaporeIOI1998XII Braves Pte LtdServer EngineerIndexed profileCVChan Vee ChongSingaporeIMO1993Competition recordBronze medalIndexed profileCWChan Wa IoMacauIMO1997Competition recordHonourable mentionCGChao GuChinaIMO2013Competition recordGold medalCKChao Keong LoMacauIMO2011Competition recordBronze medalCKChao KuChinaIMO1990OneStep TSP, Inc. (aka OneStepRide)Founder and CEOAutumn profileCLChao LiChinaIOI2012Competition recordGold medalCTCharaf TahiriMoroccoIMO1995Competition recordBronze medalCGCharalampos GeorgiouCyprusIOI2020 · 2021Competition recordBronze medalCGCharalampos GeorgiouCyprusIMO2019 · 2020Ancoria BankSoftware DeveloperIndexed profileCTCharel ThullLuxembourgIMO2014Competition recordBronze medalCECharilaos ErnopoulosGreeceIOI1999Competition recordBronze medalCPCharilaos PipisGreeceIOI2017 · 2018MicrosoftIndexed profileCBCharles BattyUnited KingdomIMO1970University of OxfordProfessorIndexed profileCDCharles Dacheng LiAustraliaIMO2018Australian Mathematics TrustMathematics Olympiad TutorIndexed profileCDCharles DaiFranceIMO2023Competition recordBronze medalCDCharles DaiFranceIOI2022 · 2023Competition recordSilver medalCJCharles James BradshawSouth AfricaIMO2006GoogleSenior Software EngineerIndexed profileCJCharles JamesonAustraliaIOI2017Competition recordSilver medalCLCharles LiAustraliaIMO2006Competition recordSilver medalCSCharles S. TimarCanadaIMO1981 · 1982Competition recordSilver medal · Bronze medalCWCharles WalterUnited States of AmericaIMO1978Competition recordBronze medalCWCharles William O. AngPhilippinesIMO2005Competition recordHonourable mentionCNCharuka Nishala Kulathunga Bandara Herath MudiyanselageSri LankaIMO2015 · 2017 · 2018Loughborough University LondonPostdoctoral Research AssociateIndexed profileCCChatawut ChanvanichskulThailandIMO1996PTTEPSenior Engineer - Technology Venture (Decommissioning Technology and Others)Indexed profileCSChatchanun SuriyaammaranonThailandIMO2018Competition recordSilver medalIndexed profileCMChawalit MachimdamrongThailandIOI1994Epsilon Co.,LtdIndexed profileCKChe-An KangTaiwanIMO2026Competition recordBronze medalCHChedi HammamiTunisiaIMO2024Indépendant2eme annee secondaire lyceeIndexed profileCKChedly KhemakhemTunisiaIMO2011Oliver WymanConsultantIndexed profileCHChee Hau TanSingaporeIMO2000Competition recordBronze medalCWChee We NgSingaporeIMO1992DSTASenior EngineerIndexed profileCJChei Jun RyuDemocratic People's Republic of KoreaIMO1992Competition recordSilver medal
Chai HaixinChinaIOI1989LenovoExecutive DirectorAutumn profileCKChai Kian MingSingaporeIOI1993 · 1994DPI Holdings BerhadDeputy Managing DirectorIndexed profileChaitanya RaoAustraliaIMO1994Institute of DataLead Trainer, Head of Learning (Data Science) and Product Development ManagerAutumn profileCTChaitanya TappuIndiaIMO2014Competition recordBronze medalCMChaiyasit ManovitThailandIOI1993Competition recordSilver medalIndexed profileCFChak Fai YuenHong Kong, ChinaIOI2010Competition recordSilver medalIndexed profileCHChak Hei YuenHong KongIMO2006Competition recordBronze medalCEChams Eddine Abd El Ali DerrecheAlgeriaIMO2023 · 2024Competition recordBronze medal · Gold medalCCChan Chia KhowMalaysiaIMO1996Competition recordHonourable mentionCTChandhopama Thidas Bandara WanasingheSri LankaIMO2020 · 2022 · 2023Competition recordHonourable mentionCAChandresh Amrit RamlaganTrinidad and TobagoIMO2008 · 2009MercorMathematics ResearcherAutumn profileCFChan Fong WongMacao, ChinaIOI1999Competition recordBronze medalCHChang Hao TsaiTaiwanIOI1994 · 1995Competition recordBronze medal · Silver medalCZChangjin ZhengChinaIMO1997Competition recordGold medalCJChang Jun LimMalaysiaIOI2024 · 2025Singapore Informatics LeagueScientific Committee MemberIndexed profileCYChangkai YuSingaporeIMO1989 · 1990Competition recordBronze medal · Honourable mentionCLChangsu LeeRepublic of KoreaIOI2014QuoraSoftware EngineerIndexed profileCYChang Yang YewMalaysiaIMO2003Royal Hobart HospitalAnesthesiology ResidentIndexed profileCMChangzhi Michel YangBelgiumIMO2026Competition recordBronze medalCXChangzhi XieChinaIMO2015University of Southern CaliforniaPhD Student, Computer ScienceAutumn profileCHChan Hwai-LianTaiwanIMO1996 · 1997Competition recordSilver medalCJChan-Il JungRepublic of KoreaIOI2003Competition recordSilver medalCLChanin LaohaphanThailandIOI2004KASIKORN Business-Technology Group [KBTG]Data & AI Program Manager (Head of Level)Indexed profileCMChan Min KimRepublic of KoreaIOI2008GoogleSoftware EngineerIndexed profileCSChan Sin HuanSingaporeIOI1998XII Braves Pte LtdServer EngineerIndexed profileCVChan Vee ChongSingaporeIMO1993Competition recordBronze medalIndexed profileCWChan Wa IoMacauIMO1997Competition recordHonourable mentionCGChao GuChinaIMO2013Competition recordGold medalCKChao Keong LoMacauIMO2011Competition recordBronze medalCKChao KuChinaIMO1990OneStep TSP, Inc. (aka OneStepRide)Founder and CEOAutumn profileCLChao LiChinaIOI2012Competition recordGold medalCTCharaf TahiriMoroccoIMO1995Competition recordBronze medalCGCharalampos GeorgiouCyprusIOI2020 · 2021Competition recordBronze medalCGCharalampos GeorgiouCyprusIMO2019 · 2020Ancoria BankSoftware DeveloperIndexed profileCTCharel ThullLuxembourgIMO2014Competition recordBronze medalCECharilaos ErnopoulosGreeceIOI1999Competition recordBronze medalCPCharilaos PipisGreeceIOI2017 · 2018MicrosoftIndexed profileCBCharles BattyUnited KingdomIMO1970University of OxfordProfessorIndexed profileCDCharles Dacheng LiAustraliaIMO2018Australian Mathematics TrustMathematics Olympiad TutorIndexed profileCDCharles DaiFranceIMO2023Competition recordBronze medalCDCharles DaiFranceIOI2022 · 2023Competition recordSilver medalCJCharles James BradshawSouth AfricaIMO2006GoogleSenior Software EngineerIndexed profileCJCharles JamesonAustraliaIOI2017Competition recordSilver medalCLCharles LiAustraliaIMO2006Competition recordSilver medalCSCharles S. TimarCanadaIMO1981 · 1982Competition recordSilver medal · Bronze medalCWCharles WalterUnited States of AmericaIMO1978Competition recordBronze medalCWCharles William O. AngPhilippinesIMO2005Competition recordHonourable mentionCNCharuka Nishala Kulathunga Bandara Herath MudiyanselageSri LankaIMO2015 · 2017 · 2018Loughborough University LondonPostdoctoral Research AssociateIndexed profileCCChatawut ChanvanichskulThailandIMO1996PTTEPSenior Engineer - Technology Venture (Decommissioning Technology and Others)Indexed profileCSChatchanun SuriyaammaranonThailandIMO2018Competition recordSilver medalIndexed profileCMChawalit MachimdamrongThailandIOI1994Epsilon Co.,LtdIndexed profileCKChe-An KangTaiwanIMO2026Competition recordBronze medalCHChedi HammamiTunisiaIMO2024Indépendant2eme annee secondaire lyceeIndexed profileCKChedly KhemakhemTunisiaIMO2011Oliver WymanConsultantIndexed profileCHChee Hau TanSingaporeIMO2000Competition recordBronze medalCWChee We NgSingaporeIMO1992DSTASenior EngineerIndexed profileCJChei Jun RyuDemocratic People's Republic of KoreaIMO1992Competition recordSilver medal