Leadership Team
BEAU HLB (HLB Switzerland)
Ronald Beau
Director, Head of ACCOUNTING & CORPORATE SOLUTIONS
As founder, director and CEO of BEAU HLB, Ronald is involved in all service lines, with a particular focus on the planning of tax, legal and corporate affairs for private estates and international groups.
Marina Bousi
Deputy Director, Head of LEGAL
As Deputy director and Head of LEGAL, Marina is specialized in corporate taxation law. She advises clients on the legal and tax aspects related to the constitution of companies in Switzerland and abroad.
Léo Zarola
Deputy Director, Head of CORPORATE SERVICES
Léo Zarola supervises a team of accountants and consultants specialized in the administration of Swiss companies
Jessica Ouazana
Deputy Director, Head of TAX
As Deputy-Director and Head of our TAX service line, Jessica specializes in Swiss and international tax matters dealing with both corporate accounts and private clients. She has a deep knowledge of the Swiss tax system.
Cem Unal
Vice Director, Head of AUDIT
As Vice Director and Head of our AUDIT service line, Cem provides a wide range of audit services, including the preparation of reports, recommendations, advice and the management of special mandates.
Isabel Amar-Castro
Deputy Director, Head of HR & PAYROLL SERVICES
As Deputy-director and Head of HR & Payroll services line, Isabel leads a team of consultants, accountants, payroll and company administration specialists serving corporate clients in their day-to-day administration
Martin Eisner
Partner, lic. oec. publ., certified fiduciary expert
After completing his business studies in 2009, Martin Eisner worked for various consulting companies as a mandate manager for fiduciary services and taxes. He qualified as a certified fiduciary with federal diploma and later as...
Patrick Bhend
Swiss certified accountant, licensed audit expert
Patrick Bhend has been active in the finance industry since 2012 and has multi-year experience in the areas of trade finance as well as auditing. He worked many years for a trade finance enterprise abroad...
Reto Arnold
Partner, lic. oec. HSG, certified tax expert, DAS in VAT FH, certified financial analyst and asset manager, CIIA®
After graduating from the University of St. Gallen as lic. oec. HSG, Reto Arnold worked as a tax advisor in international accounting and consulting firms (four big companies), a large business law firm as well...
TRETOR AG (HLB Switzerland)
Adrian Müller
Vice-Director, Swiss Certified Public Accountant, Licensed Audit Expert
As managing partner, Adrian is involved in all of our service lines. Besides that, he is the main responsible person for the service line audit. About Adrian My professional career originally began with an apprenticeship...
Adrian Schaller
Managing Partner, Swiss Certified Public Accountant, Licensed Audit Expert
As a graduate of the University of Basel (Master in Business and Economics), I started my professional career anno 2006 at KPMG in Basel. The work and training in the field of auditing inspired me...
Michael Rüegger
Partner, Swiss Certified Tax Expert, Swiss Certified Public Accountant, Licensed Audit Expert
During my professional career so far, direct client contact and ensuring individual and optimal client advice have always been extremely important to me. TRETOR AG offers me an ideal environment to apply my knowledge and...
