The prestigious legal directory Chambers & Partners launched in 2016 the first edition of the Chambers High Net Worth Guide (HNW); its first publication specifically aimed at the international private wealth market.

The 2026 edition of the renowned publication has awarded ARIFA partner Gian Castillero a Band 1 status for his work and experienced legal advice to private clients. According to the publication, Mr. Castillero, head of the firm's private client practice, is highly sought after for his expertise in estate and international tax planning.

"Gian Castillero is our trusted adviser. His contribution is comprehensive and makes the legal implications clear to us, but also takes the context of our business and the macroeconomic scenario into account"

"Gian is an excellent professional in the field; he greatly understands the complexities of our clients"

"Gian brings a global perspective to our requirements, and we consider him an excellent adviser for our clients"

"Gian Castillero is an extraordinary adviser to our family. He has a remarkable ability to empathise with clients and a knack for synthesis that helps us make decisions and move forward"
Chambers HNW 2026

About Chambers HNW

Chambers HNW was launched in 2016 as a key reference point for family offices and professional advisers to wealthy individuals. It provides objective guidance on private wealth management work and related specialisms in key jurisdictions on an international scale. Chambers HNW also features listings and information about many of the top accountancy and tax firms, private banks, wealth management firms and multi-family offices acting for wealthy individuals and families.