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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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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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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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 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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Our Team

Philip Sweeney


Phillip Sweeney is a qualified as a Solicitor in 1980 in the U.K., and practiced in West Yorkshire. He was a Senior Partner at Opus Law (a Legal 500 firm) in the U.K. 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. Today, Philip Sweeney lives in Thailand, frequently commuting between Chiang Mai and Bangkok. He  still remains a Consultant Solicitor to his firm in England. Sweeney brings with him, more than 30 years of invaluable legal experience.

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 Sheffield University, 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.

Martin Moessing

Legal Advisor

Martin obtained his Bachelor’s Degree in Law ( LLB ) from Ramkhamhaeng University. He also has a Certificate in English for Lawyers from Thammasat University and is at present studying for his Masters Degree in Business Law at Sripatum University. Martin expects to obtain his Thai Lawyer’s License in 2016. He has experience in both Criminal and

Civil proceedings, Work permits and Visas, Corporate Law and Company Formation, Amity Treaty applications, Trademarks and Licensing Law ( Import/Export, Food and Alcohol ). He speaks English fluently.