Sebastien H. Brousseau | Founder of ThaiLawOnline

A professional history built around expatriate life

Sebastien founded ThaiLawOnline in 2006 and Isaan Lawyers in Nakhon Ratchasima in 2007. He also managed Siam Legal’s Pattaya office for part of 2007. His years in Korat brought sustained experience with international families, foreign property buyers and businesses operating outside Bangkok.

Provincial practice required close attention to local administration. A well-written agreement was only part of the work. Clients also needed accurate translation, suitable supporting documents, a clear understanding of different applications.

His professional record includes the years he built and managed Isaan Lawyers before the sale and handover around the end of 2021 and beginning of 2022. He subsequently concentrated on ThaiLawOnline, expanding its services and legal information resources from Bangkok.

Isaan Lawyers now operates under separate ownership and management. Earlier publications or feedback specifically concerning Sebastien belong to his personal professional history. They should be read in their original context, with the relevant date and firm identified.

Longstanding work on usufructs and foreign property rights

Usufructs have been a particular focus of Sebastien’s work since the early years of his legal work in Thailand. During the 2006–2010 period, it was very rare to see usufructs done at the land department. In 2008, Sebastien wrote a long article about them on “Thaivisa” now named “aseannow”.

Attention to the underlying situation remains central to his approach. A client buying a home with a Thai partner needs to understand the relationship between ownership, occupation, financing, inheritance and the agreement being proposed. A familiar legal term is not enough to establish whether a structure fits the client’s needs.

His property work also includes leases, superficies, condominium due diligence and Sap Ing Sith. In 2023, he published explanations of Sap Ing Sith and coordinating practical preparation for registration in several province when sap-ing-sith were hardly done.

Read ThaiLawOnline’s usufruct guide, Sap Ing Sith guide and condominium purchase guide.

Family matters where more than one country is involved

Much of Sebastien’s work concerns international families. His experience includes prenuptial agreements, divorce, child custody, the recognition of fathers’ rights, wills and estate matters. These files often require coordination between a foreign client, Thai family members, the Thai legal team and professionals abroad.

He worked with Thai lawyers on matters arising during Thailand’s 2014–2015 surrogacy crisis. The work involved sensitive questions about parental rights, documentation and the position of international families during a period of legal change. His correspondence from this period also records firm advice against proposed arrangements he considered too risky.

For clients, this approach means clear explanations before commitments are made. What is the objective? Which documents are missing? Who holds the relevant rights? What needs to happen in Thailand, and what requires advice in another country? Those questions help the team identify the work required and explain the limits of a proposed solution.

For current services, see prenuptial agreements, divorce and wills in Thailand.

Public advocacy during the 2019 TM30 controversy

In 2019, Sebastien helped organise and led a public petition calling for reform of Thailand’s TM28 and TM30 reporting arrangements. The campaign addressed the practical burden experienced by foreign residents and their Thai families.

He participated in the Foreign Correspondents’ Club of Thailand discussion alongside senior immigration officials and other speakers. Le Petit Journal interviewed him about the campaign in August 2019, identifying him as the director of Isaan Lawyers and an organiser of the petition. Contemporary coverage also appeared in The Phuket News and The Thaiger.

The campaign brought ordinary residents’ experiences into a public discussion about immigration administration. It is part of his wider interest in making legal rules understandable and drawing attention to problems affecting the expatriate community.

Contemporary reporting: Le Petit Journal interview, 30 August 2019 · The Phuket News report · The Thaiger panel coverage.

Public service, prisoners’ rights and community work

Sebastien’s public service began in Canada, before the development of ThaiLawOnline. He served as president of the Office des droits des détenu-e-s, a non-profit organisation defending and promoting prisoners’ rights, and worked as a volunteer.

He appeared before a House of Commons subcommittee reviewing the Corrections and Conditional Release Act. His presentation addressed access to medical care, conditions of detention, parole decision-making and ways for prisoners to raise complaints. The official record identifies him as the organisation’s president.

The subcommittee’s report subsequently discussed his evidence on compassionate release for terminally ill prisoners. This is a documented contribution to a national legislative review, connecting his legal and criminology training with practical questions about dignity, rehabilitation and access to justice.

His community work also included serving as president and volunteering with Tel-Ressources. He assigned the author royalties from his prisoners’ rights book to a Canadian charity. These commitments place public service alongside legal research and professional practice in his career.

Parliamentary record: House of Commons subcommittee report, May 2000, section 4.50.

Canadian legal experience and publications

Sebastien holds an LL.B. and a B.Sc. from the Université de Montréal. His Canadian professional background includes work at Poupart Marquis, Avocats, in Montreal from 2000 to 2002.

During his work at the firm, he assisted Guy Poupart on work relating to the defence of Pauline Nyiramasuhuko before the International Criminal Tribunal for Rwanda. Nyiramasuhuko was the first woman charged with genocide, in proceedings that became part of the Butare case. This experience belongs to his earlier work supporting the defence at a Canadian firm.

Case context: International Criminal Tribunal for Rwanda, Butare case. Tribunal records identify Guy Poupart as defence counsel.

In 2002, he co-authored Les droits des personnes incarcérées : les règles, la réalité et les ressources with criminologist Jean-Claude Bernheim. Published in Montreal by Éditions du Méridien, the book examines prisoners’ rights and correctional systems in Canada and Quebec.

The publication is recorded in the National Library of Canada’s 2002 catalogue, with ISBN 2-89546-008-6. It was also referenced in a 2023 review published by the Canadian Criminal Justice Association. These records document a legal publishing history extending well before his work in Thailand.

The book is also held in the Library of the Supreme Court of Canada, adding to its presence in legal reference collections.

An earlier document records his aptitude for research. In a letter dated 11 November 1994, Université de Montréal law professor François Chevrette recommended him for a legal research position, praising his academic work, preparation and research ability.

Read Professor Chevrette’s original recommendation letter.

Building a Thai legal reference resource

At ThaiLawOnline, Sebastien has continued to develop legal information for readers who do not work in Thai. The site brings together explanatory articles, bilingual reference material, statutory provisions, Supreme Court decisions and practical guidance.

Its annotated Civil and Commercial Code connects Thai and English text with commentary and relevant judgments. The annotated Criminal Code and Supreme Court decision collection extend this approach to criminal law and case analysis.

The aim is to give readers access to the reasoning behind an answer. A foreign property buyer should be able to move from an explanation of a usufruct to the relevant provisions and judgments. A parent should be able to identify the legal distinction underlying advice about parental rights.

Developing legal AI tools since 2023

In 2023, Sebastien established a new focus at ThaiLawOnline on applying artificial intelligence to legal research, document preparation and access to Thai legal information. November correspondence records his work on a Thai-law virtual assistant and AI-assisted document generation. By December, he was working with the Thai legal team on reference materials and inviting users to try a multilingual legal AI assistant.

The assistant was announced in December 2023 with support for English, Thai and French. He continued sharing and developing it with other legal professionals in January 2024. This places the practice’s legal AI work within the early period of public adoption of generative AI.

His current technology work includes independently managed server infrastructure, with client confidentiality a priority in system design. The purpose is to give the practice greater control over its information and workflows while developing research and document tools suited to its clients.

For Sebastien, useful legal technology connects an answer to relevant law, helps organise the material and supports the team’s work. Professional judgment and verification remain essential, especially when a client’s rights, family or property are involved.

Clear communication in English and French

Sebastien works fluently in English and French and speaks conversational Thai. Having lived in Thailand since 2004 and obtained permanent residency, he understands expatriate life from the perspective of a long-term resident as well as a legal practice manager.

ThaiLawOnline’s legal work is undertaken with licensed Thai attorneys. It includes Wichuda Atthamethakon, LL.M., is a Thai lawyer and Notarial Services Attorney who has worked with Sebastien for more than a decade. Her published lawyer licence number is 3149/2556 and her notarial registration number is 576/2566. Meet the Thai legal team.

Outside his professional work, Sebastien writes about travel, food and life in Thailand at SebastienBrousseau.com. His writing reflects the curiosity and interest in everyday life behind his long connection with the country.

Selected career milestones