Appointed as Siam Premier’s Managing Partner on 1 October 2020, Chatchavej has over 20 years’ experience in advising multinational corporations (including many corporations listed in Fortune Global 500), large Thai corporations, and Thai government agencies on corporate / M&A, antitrust and competition, real property and construction, insurance, PPPs, regulatory matters, government contracts, and all aspects of foreign investment in Thailand. He regularly acts on global acquisitions dealing with Thai assets across a broad range of sectors including automotive, energy, property, insurance, pharmaceutical, hospitality, manufacturing e-commerce and retail, where he works closely with clients, their advisors, and international counsel from global law firms.

In his insurance practice, Chatchavej has assisted a number of foreign insurers and subsidiaries of global insurance companies operating in Thailand in relation to their investment strategies, corporate restructuring, obtaining permission to lift the foreign limit, general regulatory and compliance, and M&A (on both sale side and buy side). Chatchavej has in-depth knowledge of the Thai insurance sector, and has developed excellent working relationships with the Office of Insurance Commission.

He also regularly advises global branded hotels, Thai and foreign property developers in relation to transactions large scale hotels, resorts and mixed use development projects, joint ventures and M&A transactions.

Chatchavej is ranked as a Leading Lawyer in Real Estate and Construction, Projects & Energy, and Corporate/M&A (2023) by Legal 500, Ranked Lawyer in  Corporate/M&A, Insurance and Real Estate (2023) by Chambers and Partners,  Highly Regarded in M&A by IFLR 1000, ranked in the A-List Thailand’s Top 100 Lawyers 2022 by Asia Business Law Journal, and named as a Distinguished Practitioner (Corporate/M&A) in Asialaw Leading Lawyers 2022.

The Chambers and Partners Asia-Pacific Guide refers to the “fantastic” Chatchavej Chitvarakorn as being lauded by sources as an “extremely responsive” lawyer who provides “commercial advice”. The guide also reports that Chatchavej is praised by clients as being "very impressive and responsive", and "proactive and commercially minded in helping to get deals done."

In addition to his role as Partner, Chatchavej is co-lecturer in the Relationship between Business and Law course in the Master in Arts in Economic Law program in the Faculty of Law at Chulalongkorn University. He also serves as a board member of the Chevening Alumni Association of Thailand under the Foreign Commonwealth Office through the British Embassy in Thailand.

• Acting for a UK headquartered global health insurance company on the THB 2.17 billion sale of its Thai subsidiary to a US managed global health insurance company.
• Acting for a Swiss-based global pharmaceutical company on the USD 5.4 billion disposal of its animal health business to a US global animal health company with respect to Thai assets.
• Acting for a global life insurance company and its Thai subsidiary in the THB 17.5 billion 100% share acquisition of a life insurance subsidiary of a SET-listed bank.
• Acting for a Spanish headquartered global energy company on its USD 2.23 billion acquisition of an international exploration and production company with respect to Thai assets.
• Advising a foreign EPC contractor on the RFP, Project Agreement and Thai legal environment in the bidding phase of the THB 220 billion High Speed Rail Linking Three Airports PPP Project. 
• Representing a Japanese infrastructure company on its acquisition of a biomass power plant in Thailand.
• Advising numerous leading global hotel brands on share and asset acquisition and hotel management in respect of property in Thailand.
• Advising one of the largest SET-listed property and hotel developers and operators in multiple transactions in relation to share acquisitions in a number of joint ventures.

LL.B. Chulalongkorn University (First Class Honours)
LL.M. The London School of Economics and Political Science (Merit) on the British Chevening Scholarship
Barrister-at-law