Brian Mayenfisch was born in 1991. He studied Law at the University of Fribourg, where he obtained his Bachelor of Law in 2013 ; he then continued his studies at the University of Fribourg and the Universität zu Köln (Germany), before receiving his Master of Law in 2015. During these years, Brian Mayenfisch completed various internships in law firms in Lausanne and in administrative departments of the City of Fribourg.

In 2016, Brian Mayenfisch joined the Federal Administrative Court (St. Gallen), first as an intern and then as a law clerk.

Brian Mayenfisch left the Federal Administrative Court at the beginning of 2019 to further his training at the University of Geneva, where he obtained the Certificate of Advanced Studies in Legal Professions in July 2019.

Finally, he co-authored an article to the french-speaking Commentary on the Federal Constitution (Gregor T. Chatton/Brian Mayenfisch, art. 115), which will be published in March 2021 by Helbing Lichtenhahn.

Brian Mayenfisch joined the firm of 100 Rue du Rhône Avocats in September 2019.

He is bilingual in French and English and has a good knowledge of German.