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Greg Joseph S.J. Tiongco is the co-managing partner of Tiongco Siao Bello and Associates Law Offices.


Greg has been in the practice of law for over 18 years. He has extensive experience in Corporate Law including Acquisitions and Mergers, Disputes and Litigation, Labor & Management Relations Law, and Data Privacy Law and Compliance. He served as counsel for one of the biggest acquisition of government assets in the Philippines. He also served as counsel for the entry of the third telecom player in the Philippines. Greg is also corporate counsel to a number of Philippine conglomerates, multinationals, and internationally as well as locally listed companies. Pursuant to this, he has worked with different international law Firms to service the Firm’s international clients.


Greg has been awarded and recognized as a top 10 Clients’ Choice lawyers in the Philippines (2021 and 2022) and top 50 Technology, Media and Telecommunications lawyers in Asia by the prestigious Asian Legal Business (Thomson Reuters) for work done for their clients. For 2022, Greg was also recognized a one of the Top 50 Super Disputes Lawyers in Asia.

A member of the Philippine Bar, Greg graduated with Honors garnering a silver medal from the Ateneo de Manila University School of Law.

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