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Dr Guillaume Grisel is a partner at Bonnard Lawson. He deals with cases involving international tax, banking, succession and art law, most often between Switzerland and the UK or the USA. He advises his clients in such matters as tax and estate planning (trusts, life insurances, foundations, wills, prenuptial and postnuptial agreements, art collections, etc.). He assists them before Swiss and foreign authorities, in particular the tax authorities (tax voluntary disclosures, automatic exchange of information under the CRS or FATCA, bank secrecy, lump-sum taxation, taking of residence in Switzerland or abroad). For instance, Guillaume advises numerous expats, several international artists and sportsmen, as well as art collectors and art galleries. He was chairman of the board of a classical music festival for several years. Guillaume also advises a number of financial institutions (trust companies, wealth managers) in regulatory and compliance matters.
It is during his studies at Cambridge that Guillaume specialized in the law of trusts (main onshore and offshore jurisdictions) and in international taxation. He also studied inheritance and matrimonial property laws of several jurisdictions, in continental Europe and in Common law countries.
Having studied in English at Cambridge, in German in Zurich and in French in Lausanne, Guillaume works every day in these three languages.
Guillaume published several books and articles in different fields of law, such as public and private international law, tax law, trusts and foundations, and company law. He regularly gives lectures in these fields.
Ph.D. in international law (summa cum laude)
LL.M., University of Cambridge
M.A. in Swiss law, Universities of Lausanne and Zurich (summa cum laude)
Admitted to the Bar of Canton Vaud
Registered Trust and Estate Practitioner (TEP)
Titles and memberships
Chairman of the Society of Trust and Estate Practitioners (STEP), Lausanne Branch
Vice-Chairman of the Swiss and Liechtenstein STEP Federation
Secretary of the Center for Business Law of the University of Lausanne (CEDIDAC)
Member of the Bar of the Canton of Vaud (OAV)
Member of the Swiss Bar Association (SAV / FSA)
Bippert Price (Ph.D.)
Price of the Faculty of Law of the University of Lausanne
1st Price of the Concours René Cassin (international moot court)
Nouvelles lois fédérales sur les établissements financiers (LEFin) et sur les services financiers (LSFin)
LEFin / LSFin – Nouvelles obligations légales des gérants indépendants et des trustees à partir du 1er janvier 2020 Vous …Read more
“Swiss Court Denies Request for Exchange of Third-Party Bank Data”
Guillaume Grisel interviewed by William Hoke in Tax Notes International, Sept. 16, 2019, pp 1192-1193Read more
Guillaume Grisel to speak at a seminar on trusts in Switzerland on the 4th April 2019 at Grand Hotel Kempinski, Geneva.
Cross-Border Mobility and Preferential Tax Regimes
Three Lawyers from Bonnard Lawson to speak at an international tax law seminar in Geneva on the 6th February 2019Read more
Johnny Hallyday’s death exposes the stark differences between US and European inheritance principles
French pop-legend Johnny Hallyday’s death shocked France at the end of last year. And the nation was shocked again, when …Read more
The Trust: a Powerful Wealth Tax Planning Tool for International Families in Switzerland
Viewed from abroad, Switzerland is regarded as a tax haven. Some of you may disagree, especially those of you who …Read more