Last updated on April 21, 2026
ThaiLawOnline is led by Sebastien H. Brousseau with a team of Thai-registered attorneys, accountants, translators, and paralegals. Together we bring more than 50 years of combined experience in Thai civil, business, family, immigration, and criminal law to clients in Bangkok and across Thailand.
Sebastien H. Brousseau, LL.B., B.Sc. — Managing Director
Sebastien H. Brousseau is a Canadian lawyer and permanent resident of Thailand with approximately 30 years of legal experience across both Civil and Common Law systems. He has been working with Thai lawyers since 2006 and has managed law firms in Thailand and non-profit organisations in Canada. He holds permanent residency in Thailand and currently manages ThaiLawOnline in Bangkok, with a goal of being one of the first law firms in Thailand to leverage AI for enhanced efficiency.
Sebastien trained under some of the most respected trial lawyers, including Pierre Poupart in Montreal — notably on the case of the first woman accused of genocide at the International Criminal Tribunal for Rwanda. He has also worked with Girouard Peris Goldenberg Pappas & Brabant and Siam-Legal. In 2006 he began practising with Thai lawyers and founded Isaan Lawyer, which he managed until December 2021 before focusing full-time on ThaiLawOnline.
Education & Credentials
- Bachelor of Law (LL.B.), University of Montreal, 1993–1999
- Bachelor of Arts and Sciences (B.Sc.), University of Montreal, 1992–1999
- Bar School of Quebec, Montreal, Canada, 1996–1997
- Admitted to the Bar of Quebec
- Admitted to the International Bar Association (IBA)
- Former member of Quebec Lawyers Abroad (AHQ); elected representative for Asia, Australia, Africa and South America (2012)
- Diplomas in Political Science (1993) and Criminology (1999)
Areas of Focus
- Thai family law, marriage, divorce, child custody and prenuptial agreements
- Real estate and property transactions in Thailand
- Company formation, mergers, shareholder agreements and business law
- Civil litigation and dispute resolution before Thai courts
- Estate planning, last wills and estate administration
- Immigration, visas and permanent residency advice
- Crypto, web3 and AI-driven legal technology (through Kryptologyk Co., Ltd.)
Languages
Fully bilingual in French and English; basic Spanish and Mandarin Chinese; growing fluency in Thai (including literacy) after living in Thailand since 2004.
Our Thai Legal Team
ThaiLawOnline works with a close-knit network of Thai-registered attorneys and supporting staff across the country. Our partners include trial attorneys licensed by the Lawyers Council of Thailand, notaries, certified translators (Thai/English/French), accountants registered with the Revenue Department, and paralegals who handle day-to-day filings. Depending on your matter — litigation, property due diligence, company registration, immigration, or family law — we assemble the right combination of Thai counsel and international support.
What makes us different
- Two decades on the ground. Continuous practice with Thai lawyers since 2006.
- Multilingual by design. Every client matter is handled in a language you are comfortable with — English, French, or Thai.
- Technology-forward. We use modern case-management, AI-assisted research, and secure client portals so you always know where your file stands.
- Transparent fees. Reasonable flat-fee quotes for most standard matters; hourly rates only where genuinely appropriate.
- Ethical conduct. Long-standing relationships with clients and embassies in Thailand, built on clear advice and honest expectations.
Professional Experience
- ThaiLawOnline — Manager, 2022 to present. Bangkok-based legal practice serving foreign and Thai clients.
- Kryptologyk Co., Ltd. — Manager, 2021 to present. AI and web3 legal-technology company.
- Isaan Lawyer — Founder and manager, 2007 to 31 December 2021. Full-service Thai law firm in Nakhon Ratchasima.
- Siam Legal (Thailand) — 2007. Managed the Pattaya branch office.
- Poupart Marquis, Avocats (Canada) — 2000–2002. Criminal defence and civil litigation.
- Girouard, Peris, Goldenberg, Pappas & Brabant — Student intern, 1993–1994.
Our Thai Legal Team
Wichuda Atthamethakon, LL.M. — Senior Thai Lawyer (Family, Property & Corporate)
Khun Wichuda has worked alongside Mr. Brousseau since 2013. She holds a Master of Law (LL.M.) with a focus on Thai family law, and is a licensed Thai lawyer, attorney, and notary (Thai Bar License 3149/2556). She handles divorce, child custody, loan recovery, bank disputes, Thai company formation, work permits, and corporate compliance. Fluent in English and Thai. Read full bio →
Chettaphat S. (“JJ”) — Criminal Defense Lawyer
JJ is a Thai lawyer specialising in criminal defence at both trial and appellate levels. He holds an LL.B. from Ramkhamhaeng University and is a member of the Lawyers Council of Thailand. He represents both Thai nationals and foreign clients facing criminal charges, with a strategic, client-centred approach. Bilingual in Thai and English. Read full bio →
Garn T. — Thai Barrister (Criminal Law & Litigation)
Barrister Garn T. holds a law degree from Chulalongkorn University and is a licensed Barrister-at-Law (Thai Bar License 3417/2553), registered with the Lawyers Council of Thailand. Over a decade of courtroom experience in criminal defence, corporate crime, and cross-border cases. Certified Court Interpreter in English by the Office of the Judiciary (2020). Fluent in Thai and English. Read full bio →
Orchid S. — Executive Assistant & Thai–English Interpreter
Orchid is Executive Assistant to Mr. Brousseau and a Thai–English interpreter. B.B.A. in Modern Trade Business Management from Panyapiwat Institute of Management (Second Class Honours, 2023). She manages client intake, schedules consultations, prepares documents, interprets at Land Office transfers and court hearings, and coordinates with immigration, courts, and vendors. Read full bio →
Talk to Our Team
If you have a legal question — whether it concerns a property purchase, a visa application, a family matter, a commercial dispute, or starting a company — we invite you to contact our team for an initial consultation. We reply to every enquiry personally, usually the same business day.