Olivier Mosimann

Urs P. Gnos heads the Transaction Team. His practice focuses on international and domestic mergers & acquisitions, private equity, venture capital and capital market transactions, commercial and corporate law as well as public tender offers and buy-outs. Urs P. Gnos also advises companies with respect to corporate governance matters, stock exchange regulations, corporate reorganizations and restructurings, incl. relocations. Urs P. Gnos is a member of various board of directors, among oth...

Markus Pfenninger is a partner in the Transactions Team. His fields of expertise include capital market transactions, mergers & acquisitions, finance, restructurings, collective investment schemes as well as banking and insurance regulatory matters. He is a member of the International Bar Association’s (IBA) Task Force on the Financial Crisis and a past chair of the IBA’s Subcommittee on Legal Opinions as well as a past co-chair of the IBA’s Banking Law Committee. Born i...

Reto Vonzun is a partner at Walder Wyss since 2014. His practice focuses mainly on corporate and commercial law, M&A, private equity and venture capital transactions. As co-author of the Zurich Commentary on the Simple Partnership (art. 530–551 CO) he is also recognized as one of Switzerland's leading scholars and practitioners in the area of partnership law. Finally, Reto Vonzun acts for various medium-sized and larger companies and their executive management as the 'point of first...

Dieter Hofmann heads the Litigation & Arbitration Team. His primary focus is dispute resolution in complex, mainly international cases, ranging from pre-litigation advice, representation of clients in court and in arbitration proceedings, coordination in cases involving multiple jurisdictions, enforcement of foreign judgments and arbitral awards and international legal assistance. He also sits as arbitrator in international arbitrations. Dieter Hofmann has considerable experience in compl...

Pierre-Alain Guillaume is a tax partner with Walder Wyss. He specializes in Swiss and international taxation. His mission is to reduce our clients’ tax burden to the bare minimum and to prevent any tax risk at their level, while complying fully with applicable tax rules. He handles matters related to direct taxes (individual income tax, wealth tax, corporate income tax, capital tax) as well as to indirect taxes (VAT, withholding tax, gift tax and inheritance tax). He provides the follow...

Partner Dirk Spacek is partner and in charge of the practice groups TMC and IP. He primarily deals with new business models arising in the media-, internet- and technology(IT)-sector, data protection and intellectual property law. Dirk Spacek mainly advises clients from the media, technology, industry and financial services sectors on technology-related legal matters, in particular IT-contract law, outsourcing, data protection, Internet of Things (IoT), patent research and compatibility coope...

Rodolphe Gautier heads the Dispute Resolution practice of Geneva. He has more than 15 years of experience working in litigation and arbitration. His practice focuses on commercial and banking disputes in Switzerland and international arbitration involving Swiss-connected parties, assets, substantive law or seats of arbitration. He frequently acts for multinationals, domestic companies and individuals before civil and criminal courts and arbitral tribunals. His practice also includes applicati...

Partner & Member of the Steering Committee of the CMS Competition & EU Group Marquard Christen specializes in competition (antitrust) and public procurement law. Marquard advises Swiss and foreign companies on all aspects of Swiss and EU competition law (horizontal and vertical agreements, dominance abuse, merger control and civil antitrust law) and represents them in proceedings before competition authorities and courts. Over the past 15 years, he has gained special knowledge in vari...

Robert von Rosen is a partner in the Basel office of Walder Wyss. His practice focuses on domestic and international M&A transactions (mainly private M&A/private equity and venture capital) with a focus on telecommunication, energy and life sciences. In addition, he advises mainly medium-sized and start-up companies and SMEs on questions of corporate governance, compliance, restructuring and all other legal aspects of day-to-day business operations. Robert von Rosen is a board member ...

Jacques Bonvin is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Governance and Compliance Practice, Corporate Law, Mergers and Acquisitions Law, Private Equity Law and Venture Capital Law. Jacques, who practices law in Geneva, Switzerland, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jacques is held by other top lawyers in the same geographic and legal practice area.