Sean Howard O Sullivan 🇳🇱
21 profile views · Last seen 8 month(s) ago
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About
- Training since first belt5 year(s) and 2 month(s)
- LocationRotterdam, Zuid-Holland, Netherlands
- AcademyHaven BJJ Unclaimed
- AffiliationCheckmat
Bio
Irish Art Director, Started training BJJ while working and living in the Netherlands
Achievements
2 of 18 unlockedName verified by credit card
Profile manually reviewed & certificate issued
Current rank verified by promoting instructor
Verifications received5 / 10
102550
Years trained5 / 10
5101520
Gold medals0 / 5
51025
Competition matches0 / 10
1050100
Forum posts0 / 500
5001,000
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Promotion history
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- 10 months, 25 days
Blue belt Current belt
November 6, 2025Haven BJJ
Promoted by
4 years, 3 months, 15 daysWhite belt
July 22, 2021Leiden, South-Holland
Votes received for current rank
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"legit creonte mf"
SOStill surviving thanks to you Russ!
8 month(s) ago
SOStill surviving thanks to you Russ!
8 month(s) ago
SOStill surviving thanks to you Russ!
8 month(s) ago
"Sean's Brazilian belt progression aligns with IBJJF minimums, with over four years at white belt from 2021 before his 2025 blue promotion by Checkmat black belt Daniël De Groot at Haven BJJ in Rotterdam. De Groot's rank and role as head instructor are verified via Smoothcomp profiles and academy Instagram, while O'Sullivan's affiliation appears in Dutch Open 2025 recaps tagging Haven BJJ. Seminar attendances at Dojo 09 BJJ Leiden match timelines, though no competition records were found. His promoting instructor has not reviewed to validate, but as of my Jan-2026 review, the blue appears to be legit!"
SOThanks so much for the verification!
8 month(s) ago
"Lots of high quality photo evidence. Legit!"
"Timeline, pictures and coach back it up"
Seminars, camps & workshops attended
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Taylor Pearman Seminar
May 2024
Tom Halpin
Nov 2022
Rose El Sharouni - Spider Guard
Oct 2022
Thiago Abreu
Feb 2022
Harold Harder
Sep 2021
