Thomas Zellweger majored in Law at the University of Zurich, was admitted to the Swiss Bar in 2015 and is a Certified Swiss Tax Expert. Prior to joining Tax Partner AG in 2019, Thomas was a tax lawyer in an international law firm in Zurich and worked as a tax consultant in a trust company as well as in a Big Four in Zurich.

Thomas advises clients in all aspects of national and international tax law, from corporate tax law to tax planning for private clients and represents its clients in front of courts and tax authorities. Besides national and international corporate tax law, his activities are also focused on taxation of collective investment schemes.

Thomas is a lecturer in the EXPERTsuisse education program for the diploma of Certified Swiss Tax Expert and Certified Public Accountant.