Thai English


“A lawyer without history or literature is a mechanic, a mere working mason; if he possesses some knowledge of these, he may venture to call himself an architect.”

– Sir Walter Scott

“Don't misinform your Doctor nor your Lawyer.”

- Benjamin Franklin

PILO has built an impressive team consisting of people who combine excellent domestic and international qualifications with years of valuable experience at larger international law firms. International and domestic banks, and the National Asses Management Company of Thailand. Each of our team members has passion for the law, a love of learning, and is committed to providing workable, cost-effective solutions of the highest quality to our clients.

Team includes

Edward Thiravej Ploysongsang (Partner)
Yodsakorn Sriamorn
Simon Zubin Rajan
Professor Yongyudh Ploysongsang
Dr. Sunantha Srisubut-Ploysongsang
Manuttsak Khamchay, Senior Litigator


Edward Thiravej Ploysongsang, Partner

Edward Thiravej PloysongsangEdward is a corporate and commercial lawyer with expertise in issues affecting a broad range of industries. He combines fifteen years of experience in Thailand working at Deacons, DLA Piper and in private practice together with US qualifications to provide workable commercial solutions for businesses and investors.

While working with previous employers, Edward performed substantial legal work for mostly large and medium businesses including Enron, Shell, Toyota, Microban, P.T. Teknix Capital, FedEx, Itochu, Sumitomo, Tokio Marine & Fire Insurance, J.W. Marriott, Club Med, Tony Roma’s, Standard Chartered Bank, SGS and Telecomm Asia (subsequently called True). He also completed major projects for various governments, and the international banks such as ADB and the World Bank. Edward is now offering his expertise to predominantly small and medium, international businesses located in Thailand.
Edward obtained his Bachelor of Science degree - completing an honors biology/premed curriculum - from the University of Wisconsin-Madison. He went on to complete his Master of Regional Planning degree from Cornell University, his Juris Doctorate from Washington University in St. Louis, a top-tier US law school, and his Executive Master of Business Administration from the Sasin Graduate Institute of Business Administration of Chulalongkorn University. Edward also attended law school at Temple University (US) and took law courses at University College London (UK).

At Cornell, he served as an Articles Editor for Colloqui: Cornell Journal of Planning and Urban Issues, and as an Associate of the Cornell Journal of Law and Public Policy.

At Temple University School of Law, a school renowned for its trial advocacy and legal writing programs, Edward competed in the I. Herman Stern Moot Court Competition, and won a coveted spot on the Temple Political and Civil Rights Law Review.

At Washington University School of Law, he had the great privilege of studying the interface between law and economics under Professor Douglass C. North, one of co-winners of the 1993 Nobel Memorial Prize in Economic Sciences.

At Sasin, Edward greatly expanded his knowledge of business and general management – a rare, additional qualification for any business lawyer. He was also fortunate to have completed an executive management residential at the prestigious Kellogg School of Management at Northwestern University in Chicago where he earned top marks. Upon graduation from Sasin, Edward was inducted into Beta Gamma Sigma International Honor Society for his scholastic achievements at business school.

Edward is licensed to practice law in New York and before the US Court of International Trade, US Court of Federal Claims, US Court of Appeals for the Federal Circuit, the US Tax Court and the US Supreme Court.

Edward is also a Member of the Chartered Institute of Arbitrators (UK & Thailand Association, where he served as the Public Relations Officer from 2004 - 2005), American Bar Association (International Law & Law Practice Management Sections), New York State Bar Association (International Law Section), and Mensa International. Furthermore, he has been appointed a consultant and contributor to the Foreign Affairs Committee of the Lawyers Council of Thailand, a rare distinction for a foreign-qualified attorney. Together with his fellow partner, Ann Ploysongsang, he has published over 80 articles on comparative law, namely comparing American and even English common law with the Thai civil law system.