Masi memulai karirnya di dunia balap motorbermotor sebagai sukarelawan untuk tim [[Super Touring]] pada saat masih sekolah. Dia bekerja sebagai wakil direktur balapan di seri [[Kejuaraan Supercars|Supercars]] [[touring car racing]]<ref>{{cite web|last=Chokhani|first=Darshan|date=27 March 2019|url=https://drivetribe.com/p/michael-masi-keeps-f1-race-director-c52wVNOKQ7yudu-5FpPDaA?iid=d6rW-fOjTIaOPFvMTmAVag|url-status=live|title=Michael Masi keeps F1 race director and safety delegate role for Bahrain GP|website=DriveTribe|publisher=W. Chump & Sons|access-date=7 Juni 2021|archive-date=2022-01-28|archive-url=https://web.archive.org/web/20220128102159/https://drivetribe.com/p/michael-masi-keeps-f1-race-director-c52wVNOKQ7yudu-5FpPDaA?iid=d6rW-fOjTIaOPFvMTmAVag|dead-url=yes}}</ref> dan di Reli Australia.<ref>{{cite news|url=https://www.sunshinecoastdaily.com.au/news/masi-is-revved-for-rally-rally-wrc-sport/747941/|url-status=dead|title=Masi is revved for rally|work=Sunshine Coast Daily|publisher=News Corp Australia|date=20 Januari 2011|archive-url=https://web.archive.org/web/20210607090310/https://www.sunshinecoastdaily.com.au/news/masi-is-revved-for-rally-rally-wrc-sport/747941/|archive-date=2021-06-07|access-date=7 Juni 2021|dead-url=no}}</ref> Pada tahun [[2018]], ia ditunjuk oleh [[FIA]] sebagai wakil direktur balapan [[Kejuaraan FIA Formula 2|Formula Dua]] dan Formula[[Kejuaraan TigaFIA wakilFormula direktur3|Formula balapanTiga]], dan ditunjuk sebagai wakil direktur balapan F1 [[Charlie Whiting]].<ref name="Parkes 2019">{{cite news|last=Parkes|first=Ian|date=19 September 2019|url=https://www.nytimes.com/2019/09/19/sports/autoracing/michael-masi-race-director.html|url-status=live|title=Michael Masi Dives In as Race Director|work=The New York Times|publisher=A. G. Sulzberger/The New York Times Company|access-date=6 June 2021}}</ref><ref name="Bilton 2020"/> Masi bergantian dalam peran ini antara Grand Prix dengan [[Scott Elkins,]] yang akan menjadi direktur balapan untuk ajang [[Formula E]] dan [[Kejuaraan Mobil Tur Jerman]].<ref>{{Cite news|url= https://www.bbc.co.uk/sport/formula1/60007031 |title= FIA president meets Mercedes boss Toto Wolff as part of F1 inquiry |work= [[BBC Sport]] |last= Benson |first= Andrew |date= 15 Januari 2022 |access-date= 28 Januari 2022}}</ref>
===[[Formula Satu]]===
Setelah kematian mendadak Whiting sebelum [[Grand Prix F1 Australia 2019|Grand Prix Australia 2019]], Masi mengambil alih peran sebagai direktur balapan [[Formula Satu]].<ref>{{cite web|last1=Coch|first1=Mat|last2=Howard|first2=Tom|url=http://www.gptoday.com/full_story/view/671331/Australian_Michael_Masi_appointed_F1_race_director/|url-status=live|title=Australian Michael Masi appointed F1 race director|website=GPToday.com|publisher=Digital Motorsport Media|access-date=6 Juni 2021}}</ref>
Beberapa keputusan Masi sebagai racedirektur directorbalapan menjadi sorotan dan juga bahan kajian dari para pembalap, tim, dan pers. Di sesi Kualifikasi Q2 untuk [[Grand Prix F1 Turki 2020|Grand Prix Turki 2020]], mobil sesi Kualifikasi Q2 dikirim ke trek bahkan ketika derek masih berada di trek.<ref>{{Cite web|date=2020-11-26|title=Raikkonen says Turkey Q2 crane incident was "far from ideal" · RaceFans|url=https://www.www.racefans.net/2020/11/26/raikkonen-says-turkey-q2-crane-incident-was-far-from-ideal/|access-date=2022-02-17|website=RaceFans|language=en-GB|archive-date=2022-02-17|archive-url=https://web.archive.org/web/20220217152446/https://www.www.racefans.net/2020/11/26/raikkonen-says-turkey-q2-crane-incident-was-far-from-ideal/|dead-url=yes}}</ref> Masi diminta untuk tetap mempertahankan prosedur bendera merah yang digunakan selama [[Grand Prix F1 Azerbaijan 2021|Grand Prix Azerbaijan 2021]],<ref>{{cite web|last=Wilde|first=Jon|date=7 Juni 2021|url=https://www.planetf1.com/news/michael-masi-defends-baku-restart/|url-status=live|title=Masi defends decision to restart Baku race|website=PlanetF1|publisher=Planet Sport Network|access-date=12 Januari 2022}}</ref><ref>{{cite web|last1=Collantine|first1=Keith|last2=Rencken|first2=Dieter|date=6 June 2021|url=https://www.racefans.net/2021/06/06/why-verstappens-crash-caused-a-red-flag-but-strolls-didnt/|url-status=live|title=Why the Azerbaijan GP was stopped for Verstappen's crash but not Stroll's|website=RaceFans|publisher=Collantine Media|access-date=7 Juni 2021}}</ref> dan dikritik karena keputusannya di [[Grand Prix F1 Belgia 2021|Grand Prix Belgia 2021]], termasuk menjalankan sesi kualifikasi dalam kondisi yang berbahaya,<ref>{{cite web|last=Cleeren|first=Filip|date=31 Agustus 2021|url=https://www.motorsport.com/f1/news/masi-admits-starting-q3-at-spa-was-a-mistake/6657691/|url-status=live|title=Masi admits starting Q3 at Spa was a mistake|website=Motorsport.com|publisher=Motorsport Network|access-date=31 Agustus 2021}}</ref> dan menjalankan balapan di belakang [[Mobil keselamatan|safety car]] (SC) selama tiga putaran, diduga untuk memastikan poin diberikan;<ref>{{cite web|url=https://www.formula1.com/en/latest/article.we-did-the-best-we-could-but-the-weather-got-the-better-of-us-says-masi.6SD75AurkdGjl0eNcRmKGr.html|url-status=live|title='We did the best we could but the weather got the better of us' says Masi after red-flagged Belgian GP|website=Formula 1|publisher=Formula One Group|access-date=12 Januari 2022}} Interview archived at [https://web.archive.org/web/20211219220340/https://www.youtube.com/watch?app=desktop&v=2Uky-xOowIw Wayback Machine]{{cbignore}}: {{cite web|url=https://www.youtube.com/watch?v=2Uky-xOowIw|url-status=live|title=F1 race director Michael Masi explains decision to run two lap race at Spa|website=Sky Sports F1|publisher=YouTube|date=29 August 2021|access-date=12 January 2022}}{{cbignore}}</ref> bernegosiasi dengan tim selama balapan berlangsung untuk mengubah posisi di [[Grand Prix F1 Arab Saudi 2021|Grand Prix Arab Saudi 2021]];<ref>{{cite news|last=Braidwood|first=James|date=7 December 2021|url=https://www.independent.co.uk/sport/motor-racing/formula1/f1-verstappen-hamilton-saudi-arabia-b1971174.html|url-status=live|title=Saudi Arabian Grand Prix shows F1 'misses Charlie Whiting', Christian Horner claims|work=The Independent|publisher=Independent Digital News & Media|access-date=28 December 2021}}</ref> dan dimulainya kembali balapan setelah periode [[Mobil keselamatan|safety car]] (SC) di [[Grand Prix F1 Abu Dhabi 2021|Grand Prix Abu Dhabi 2021]]. Tim [[Mercedes-Benz di Formula Satu|Mercedes]] memprotes hasilnya; protes itu tidak dipatuhi.<ref>{{cite news|last=Amako|first=Uche|date=13 Desember 2021|url=https://www.telegraph.co.uk/formula-1/2021/12/13/who-michael-masi-man-made-biggest-call-f1-abu-dhabi-race/|url-status=live|title=Who is Michael Masi? The man at the centre of Lewis Hamilton and Max Verstappen F1 title row|work=The Telegraph|publisher=Telegraph Media Group|issn=0307-1235|access-date=12 Januari 2022}}</ref>
Pada tanggal [[17 Februari]] [[2022]], Masi secara resmi dipecat dari perannya sebagai RaceDirektur DirectorBalapan oleh presiden [[FIA]], yaitu [[Mohammed bin Sulayem]].<ref>{{Cite web|title=Michael Masi replaced as F1 race director after FIA review of 2021 Abu Dhabi GP finale|url=https://www.skysports.com/f1/news/12433/12544300/michael-masi-replaced-as-f1-race-director-after-fia-review-of-2021-abu-dhabi-gp-finale|access-date=2022-02-17|website=Sky Sports|language=en}}</ref> Penerapan peraturan yang kontroversial dari Masi selama periode keselamatanakhir [[mobil akhirkeselamatan]] memiliki pengaruh langsung pada hasil gelar Kejuaraan Dunia tersebut.<ref>{{Cite news|last=Benson|first=Andrew|date=18 Februari 2022|title=Michael Masi removed as F1 race director as part of FIA restructure in wake of Abu Dhabi Grand Prix|pages=1|work=BBC News|url=https://www.bbc.com/sport/formula1/60418716|access-date=18 Februari 2022}}</ref> Dia digantikan oleh [[Niels Wittich]] dan [[Eduardo Freitas]] sebagai RaceDirektur DirectorBalapan dan dengan [[Herbie Blash]] bertindak sebagai Penasihat Senior Tetap untuk mereka.<ref name=":0" /><ref>{{Cite web|date=2022-02-17|title=FIA President Mohammed Ben Sulayem opens the way for a new step forward in Formula 1 refereeing|url=https://www.fia.com/news/fia-president-mohammed-ben-sulayem-opens-way-new-step-forward-formula-1-refereeing|access-date=2022-02-17|website=Federation Internationale de l'Automobile|language=en}}</ref> Posisi baru di dalam [[FIA]] akan ditawarkan kepada Masi.<ref>{{Cite news|last=Benson|first=Andrew|date=17 Februari 2022|title=Michael Masi removed as F1 race director as part of FIA restructure in wake of Abu Dhabi Grand Prix|pages=1|work=BBC News|url=https://www.bbc.com/sport/formula1/60418716|access-date=17 Februari 2022}}</ref> Setelah pemecatan, Masi bisa kemungkinan bisa terancam ke ajang lain, yaitu [[NASCAR Seri Piala]]. Masi menerima sebuah ancaman mematikan adalah ancaman pembunuhan.<ref name="Michael Masi diancam pembunuhan"/><ref>{{Cite news|last=Duncan|first=Philip|date=25 Februari 2022|title=Michael Masi received death threats following last season's Abu Dhabi controversy, claims Christian Horner... as Red Bull principal slams 'lack of support' for sacked F1 chief as 'disappointing'|work=[[Daily Mail]]|url=https://www.dailymail.co.uk/sport/formulaone/article-10552135/Michael-Masi-received-death-threats-following-Abu-Dhabi-controversy-claims-Christian-Horner.html|access-date=6 Maret 2022|lang=en}}</ref>
===Setelah [[Formula Satu]]===
Pada bulan [[Juli 2022]], Masi secara resmi meninggalkan [[FIA]] untuk pindah kembali ke negara [[Australia]], dan menghabiskan lebih banyak waktu bersama dengan keluarganya.<ref>{{cite web |date=12 Juli 2022 |title=The FIA confirms Michael Masi's departure |url=https://www.fia.com/news/fia-confirms-michael-masis-departure |access-date=12 Juli 2022 |website=fia.com |publisher=FIA}}</ref><ref>{{cite web |last1=Cooper |first1=Adam |title=Former F1 race director Michael Masi leaves FIA |url=https://www.motorsport.com/f1/news/former-f1-director-michael-masi-leaves-fia/10337233/?nrt=54 |website=www.motorsport.com |publisher=Motorsport Network |access-date=12 Juli 2022}}</ref> Pada bulan [[September]] [[2022]], Masi secara resmi diangkat sebagai Ketua independen Komisi [[Kejuaraan Supercars|Supercars]] di [[Australia]].<ref>{{cite web |last1=Williams |first1=Bruce |title=Masi Appointed to Role as Supercars Commission Chairman |url=https://autoaction.com.au/2022/09/01/massi-appointed-to-role-as-supercars-commission-chairman |website=autoaction.com |publisher=Auto Action |access-date=1 September 2022}}</ref>
