Lenz & Staehelin

Lenz & Staehelin is a Swiss law firm whose Private Clients group is one of the largest in Switzerland. It advises high-net-worth individuals and families on estate planning, tax, family and inheritance law and immigration.

It acts as executor, tax adviser and, through its own trust companies in Switzerland and Guernsey (L&S Trust Services), as trustee. Its expertise includes planning wealth management structures such as commercial and private trust companies and family offices, and providing family office services including tax declarations.

Key facts

• Home market: Switzerland (Geneva and Zurich)
• Head of Private Clients: Lucien Masmejan
• Co-heads: Heini Rüdisühli (also Deputy Managing Partner) and Alexander Greter
• Trust arm: L&S Trust Services, Switzerland and Guernsey

What the firm does

• Succession planning and executorship.
• Wills, inheritance agreements and pre- and post-nuptial agreements.
• Family office services, including all relevant tax declarations.
• Relocation planning: legal and tax planning for changes of residence.
• Wealth structures: commercial and private trust companies and family offices.
• Charities and foundations, private investment companies and funds, art and antiques.
• Trust and estate disputes: litigation, arbitration and mediation.

For family offices

Lenz & Staehelin suits families moving to or based in Switzerland who want a top Swiss firm that can also serve as trustee and handle family office tax filings.

Considerations and fit

Its focus is Swiss law and Swiss-resident or Swiss-connected families. Fees are not published.

Frequently asked questions

Does Lenz & Staehelin offer family office services?

Yes. Its Private Clients group provides family office services including handling all relevant tax declarations, and plans family office and private trust company structures.

Does Lenz & Staehelin act as trustee?

Yes, through its own trust companies in Switzerland and Guernsey, L&S Trust Services.

Who heads Lenz & Staehelin's Private Clients group?

Lucien Masmejan is Head of Private Clients; Heini Rüdisühli and Alexander Greter are co-heads.

Sources: lenzstaehelin.com private clients page. Facts checked 21 October 2026.

• Succession and executorship
• Family office tax declarations
• Relocation planning
• Trust and PTC structuring
• Foundations
• Estate disputes

• Own trust companies in Switzerland and Guernsey
• One of Switzerland's largest private client teams
• Relocation tax planning
• Art and antiques
• Private investment companies and funds

Built for Private Wealth Owners / Principals, Single Family Office (SFO).

Yes