Opus is a Law Firm based in Bangkok but providing both a national and an international service for both the Thai and the Foreign community.

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Opus Law can assist you with all the legalities when it comes to visas and work permits. Everyone must comply with the visa requirements of Thailand. The details of visas and work permits tend to be complex and hard to understand. Let Opus Law’s experienced lawyers cut through the confusion and do the work for you.
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The likelihood that you or your company will experience some kind of litigation is high. Dispute is common when it comes to business. Whenever you find yourself in a difficult situation, let Opus Law handle the entire litigation process. We specialize in handling a range of common litigation issues such as customer and vendor disputes, breach of warranties, and even bankruptcy and adversarial proceedings. 
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When it comes to dealing with the legalities of your property or potential property, it’s recommended to work with trained attorneys who are well-versed in property law. If you find yourself in need of legal assistance in dealings of property, please contact Opus Law for help.
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Our trained attorneys demonstrate their expertise when handling business situations which range from contract drafting, transactions, mergers and acquisitions, negotiations, and more. Opus Law can assist you with any of your legal business needs.
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Opus Law attorneys are experts in family law in Thailand. Your family’s legal needs deserve to be handled with the utmost care and sensitivity. We provide a range of services to assist you and your family with legal help when it becomes necessary
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Our Team

Philip Sweeney

Director and Legal Consultant

Philip Sweeney qualified as a Solicitor in 1980 and practiced in West Yorkshire. He was the Senior Partner of Opus Law (a Legal 500 firm) with offices in Bradford London and Birmingham, dealing with all Serious Fraud and Complex  Crime and Regulatory matters until his retirement as a Partner in 2014. He as a Solicitor gained his Higher Rights enabling him to appear in any Criminal Court throughout England and Wales. He is retained as a Consultant Solicitor to his firm in England. He commutes between Chiang Mai and Bangkok on a regular basis.

Wirun Suwanno


Wirun Suwanno has had legal experience both at home, in Thailand, and abroad. He attended Thammasat University, where he gained his Bachelor’s degree in Law; and obtained his LLM (Master of Law) in Commercial Law from the University of Sheffield, a top ranked law school in the United Kingdom. In addition to being a licensed Notarial Services Attorney, he has extensive experience in criminal and civil litigation – more specifically, commercial legal matters (BOI and Transnational Company Share Purchase Agreements) that would be beneficial knowledge for any expatriates with businesses in Thailand. Suwanno has been a licensed lawyer in Thailand since 2002.

Pongpat Riangkruar

Legal Advisor

Pongpat Riangkruar LLB, LLM, PhD, Barrister at Law

Pongpat commenced his career as a Legal Officer for the Council of State. Later he was assigned to the Secretary of the Legislation Draft Committee providing law drafting services and legal opinion to the Cabinet and Government Organisations. From 1982-2007 he worked as a State Attorney for the Attorney General's Office. During this time he obtained two Master's Degrees in Law, one from the USA and a PhD from Maghad University, India. In 2007 he transferred to the Ministry of Justice and held key positions such as the Director of Legal Bureau, Director of Information Technology, Chief Knowledge Officer of the Ministry, Thai delegate to the UN Convention against Corruption, Member of Legal Advisory Boards to Government organisations. He retired from Government Service in 2014. He is now a part time University lecturer and Legal Adviser to two International Law firms.