Setting myself high goals, learning from my mistakes and pursuing continuous self-improvement: in law as in sport, I am an athlete!

Guillaume Jeangros focuses on domestic and international civil and commercial litigation, including international mutual assistance in criminal and civil matters. His main areas of practice include general contract law, labor law, inheritance disputes and debt enforcement proceedings.

Guillaume is particularly appreciated by his clients and peers for his reactivity, his language skills and his joyful character.


  • Since 2022 Senior Associate at Altenburger
  • 2019-2022 Associate at Altenburger
  • 2016-2018 Associate at CMS von Erlach Poncet AG
  • 2014-2016 Legal intern at CMS von Erlach Poncet AG


  • 2019 LL.M., University of California at Berkeley
  • 2016 Bar admission
  • 2014 Certificate of Advanced Studies in Legal Profession, University of Geneva
  • 2014 Bilingual Master of Laws, Universities of Geneva and Basel
  • 2013 Certificate in Transnational Law (CTL), University of Geneva

Bar / Court Admission

At all Swiss courts

Special Engagements


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Speaking Engagements

Speaking Engagements

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Full List of Publications

Further Publications

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