Guillaume is a partner at Schellenberg Wittmer (Private Wealth Department).
He is also vice-chair of the Swiss and Liechtenstein STEP Federation and Chairman of the Lausanne Chapter of the British-Swiss Chamber of Commerce (BSCC)
He is the author of the only comprehensive legal and tax textbook on trusts in Switzerland (Le trust en Suisse, 2020).
He widely publishes and speaks in various areas of law, including trusts, estate planning and taxation. Guillaume studied law at the universities of Cambridge (UK), Lausanne and Zurich. He holds a Ph.D. in international law.